Imbalance or Unbalance Which Is Correct: The Definitive Guide

Quick answer: Use imbalance when you need a noun meaning a lack of balance or unequal distribution. Use unbalance only as a verb meaning to cause something to lose balance. In nearly every case where writers hesitate between these two, “imbalance” is the correct choice.

These two words look similar and share the same root, which creates constant confusion in professional writing. I’ve corrected this exact mistake in countless cover letters, academic papers, and business reports over my fifteen years as a copy editor. The distinction is actually straightforward once you understand the grammatical roles each word plays.

When to use imbalance

Imbalance functions as a noun, and it’s the word you want when describing a condition, state, or situation where things are not properly balanced. This is by far the more common word in professional and academic writing. According to Merriam-Webster, imbalance refers to a lack of balance or proportion, and it appears constantly in medical, economic, and social contexts.

Use “imbalance” when you’re naming a problem or describing an existing condition. Think of it as the state of being unbalanced, not the act of becoming unbalanced.

Here are real-world examples showing correct usage:

• “The electrolyte imbalance in the patient’s blood required immediate intravenous treatment.”
• “The trade imbalance between the two countries has widened significantly over the past decade.”
• “Work-life imbalance is burning out young professionals across the tech industry.”

I see this word constantly in medical reports, economic analyses, and HR documents. Here’s a concrete example from a resume I edited last month:

Incorrect: “Managed team unbalance during the merger transition.”

Correct: “Managed team imbalance during the merger transition.”

The resume writer was describing a state—an existing condition of uneven workload distribution among team members. That requires the noun “imbalance,” not the verb form.

Another example from a client’s LinkedIn bio:

Incorrect: “Specialist in correcting chemical unbalance in industrial processes.”

Correct: “Specialist in correcting chemical imbalance in industrial processes.”

When you’re naming the thing that exists (the imbalance), you need the noun. The prefix “im-” here functions the same way it does in words like “impossible” or “immature”—it indicates the absence or opposite of the root word.

When to use unbalance

Unbalance works primarily as a verb, meaning to cause someone or something to lose their balance or stability. You’ll use this word far less frequently than “imbalance,” and it appears mainly in physical or mechanical contexts. The Collins Dictionary notes that while “imbalance” dominates as the standard noun form, “unbalance” serves a different grammatical function entirely.

Use “unbalance” when you’re describing an action—when something actively causes loss of balance.

Here are correct usage examples:

• “The heavy backpack on one shoulder began to unbalance the hiker on the rocky trail.”
• “Removing that support beam could unbalance the entire structural system.”
• “The controversial statement was designed to unbalance the debate and provoke emotional responses.”

Let me show you a real editing scenario from a technical manual I revised:

Incorrect: “The unbalance in the rotor caused excessive vibration.”

Correct: “The imbalance in the rotor caused excessive vibration.”

Wait—that’s actually correct as “imbalance” because we’re naming the condition that existed in the rotor. But if we’re describing what happened:

Correct (verb usage): “The uneven weight distribution will unbalance the rotor during high-speed operation.”

Here’s another example from an email I corrected for a project manager:

Incorrect: “The sudden budget cuts unbalance our resource allocation.”

Correct: “The sudden budget cuts created an imbalance in our resource allocation.”

The writer was trying to describe a resulting state (the imbalance), not the action of causing imbalance. If they wanted to use “unbalance” as a verb, they’d need to restructure: “The sudden budget cuts will unbalance our resource allocation system.”

One more from a student’s essay:

Incorrect: “Social media can unbalance your perception of reality.”

Correct: “Social media can unbalance your perception of reality.” (verb—this is actually correct!)

Also correct: “Social media creates an imbalance in your perception of reality.” (noun)

Both work here, but they serve different grammatical roles. The first uses “unbalance” as a verb (an action), while the second uses “imbalance” as a noun (a state or condition).

How to remember the difference

Here’s the memory trick I teach every junior editor on my team: If you can put “the” or “an” in front of it, use imbalance.

Try it:

• “The imbalance” ✓ (makes sense—noun)
• “The unbalance” ✗ (sounds wrong)
• “An imbalance” ✓ (makes sense—noun)
• “An unbalance” ✗ (sounds wrong)

Another foolproof method: Replace the word with “problem” or “issue.” If the sentence still makes sense, you need the noun “imbalance.”

Example:

• “The hormone [imbalance/problem] caused symptoms.” ✓ Works—use “imbalance”
• “The wind will [unbalance/problem] the ladder.” ✗ Doesn’t work—use “unbalance” (verb)

Here’s my editor-level insight: Think of the prefixes. “Im-” (like in “impossible”) creates a noun describing a state of being. “Un-” (like in “undo” or “unlock”) typically creates a verb describing an action. When you’re naming something that exists, reach for “imbalance.” When you’re describing something that happens, consider “unbalance.”

One more trick: If you can add “-ed” to make it past tense, use unbalance.

• “Unbalanced” works (verb in past tense)
• “Imbalanced” exists but functions as an adjective, not a past-tense verb

Common mistakes and exceptions

The most frequent error I encounter is writers using “unbalance” as a noun when they mean “imbalance.” This mistake appears constantly in business writing, academic papers, and even published articles.

Common error pattern:

Writers think: “I need to describe something that’s not balanced, so I’ll use ‘unbalance’ because it has ‘un-‘ which means ‘not.'”

Reality: While “un-” does mean “not,” the word “unbalance” evolved primarily as a verb, not a noun. The established noun form is “imbalance.”

Here’s a real example from a grant proposal I edited:

Incorrect: “The research will address the unbalance in healthcare access.”

Correct: “The research will address the imbalance in healthcare access.”

Another widespread mistake: Using “imbalance” as a verb.

Incorrect: “The scandal imbalanced the entire organization.”

Correct: “The scandal unbalanced the entire organization.” (verb)

Also correct: “The scandal created an imbalance in the entire organization.” (noun)

US vs. UK differences:

Good news—this is one area where American and British English agree completely. Both varieties use “imbalance” as the standard noun and “unbalance” primarily as a verb. You won’t find regional variation causing confusion here.

Exception note:

In highly specialized mechanical engineering contexts, you might occasionally see “unbalance” used as a technical noun to describe the specific condition of a rotating object that’s not centered on its axis. However, even in these technical fields, “imbalance” remains more common and is never wrong. Unless you’re writing for a specific journal or organization that mandates “unbalance” as technical terminology, stick with “imbalance” for noun usage.

The adjective trap:

Both “imbalanced” and “unbalanced” work as adjectives, but they’re used differently:

• “An imbalanced diet” (describing the diet itself as lacking balance)
• “An unbalanced load” (describing something that has been caused to lose balance)

In practice, “unbalanced” is far more common as an adjective than “imbalanced.” When in doubt as an adjective, “unbalanced” is usually safer.

Frequently Asked Questions

Can I use “unbalance” as a noun in formal writing?

Technically yes, but you shouldn’t. While some dictionaries list “unbalance” as a rare noun form, it’s nonstandard and will make your writing look amateurish. Always use “imbalance” when you need a noun in professional, academic, or published writing.

Is “imbalance” only used for physical balance, or can it describe abstract concepts?

“Imbalance” works for both physical and abstract contexts. You can discuss “muscular imbalance” (physical), “power imbalance” (social/political), “chemical imbalance” (medical), or “work-life imbalance” (lifestyle). The word is extremely versatile across all registers.

Why do spell-checkers sometimes flag “imbalance” as incorrect?

They shouldn’t—if your spell-checker is flagging “imbalance,” it’s likely a settings issue or outdated dictionary. Both “imbalance” and “unbalance” are standard English words. However, if you’re using “unbalance” as a noun (incorrectly), some advanced grammar checkers like Grammarly will catch that error.

What’s the difference between “imbalance” and “disequilibrium”?

Both mean a lack of balance, but “disequilibrium” is more technical and formal, appearing frequently in economics, chemistry, and psychology. “Imbalance” is more versatile and accessible for general audiences. Unless you’re writing for a specialized academic journal, “imbalance” is usually the better choice for clarity.

Margaret Walker

Margaret Walker is an accomplished linguist with over two decades of experience specializing in historical linguistics and word comparisons. With a Ph.D. in Linguistic Anthropology from Harvard University, her career has been marked by her comprehensive studies in language variation and change, particularly in English dialects and regional word patterns. Margaret’s interest in the evolution of language and its social implications drew her to focus on comparing words and phrases that exhibit regional differences and their origins. Her articles are known for their depth in exploring how historical events and cultural shifts influence language changes. At CompareMyWords, Margaret examines and writes on comparative semantics, dialectal diversity, and previously undocumented lexical items, bringing a historical perspective to contemporary issues in language.