Failure vs That ain't working

When to use each in English, with meaning, register, and examples.

Failure

Top 1,000 (very common)B2noun

That ain't working

InformalTop 5,000 (fairly common)
Most formal: FailureMost common: Failure
 FailureThat ain't working
Pronunciation🇬🇧 /["/ˈfeɪljə(r)/"]/🇺🇸 /["/ˈfeɪljər/"]/🇬🇧 //ðæt eɪnt ˈwɜːkɪŋ//🇺🇸 //ðæt eɪnt ˈwɜrkɪŋ//
Meaningnot succeeding in somethingThat is not functioning or effective.
ExampleHis failure to meet the deadline cost the company a valuable contract.I tried fixing it, but that ain't working at all.
RegisterNeutralInformal
How commonTop 1,000 (very common)Top 5,000 (fairly common)
CEFR levelB2-
Part of speechnoun
Collocationscomplete, total, abject, be doomed to, end in, result in, rate, fear of failure, a history of failure, a possibility of failure, big, great, serious, be, represent, prove, arise from something, failure of, fundamental, general, manifest, excuse, justify, constitute, mechanical, structural, technical, cause, lead to, result in, occur, failure in, mechanical, structural, technical, cause, lead to, result in, occur, failure in, mechanical, structural, technical, cause, lead to, result in, occur, failure inthat ain't right, that ain't fair, that ain't easy
Antonymssuccess, achievement, victory-
Common mistakesUsing 'failure' as a verb instead of a noun., Confusing 'failure' with 'fault,' thinking they mean the same., Not using appropriate prepositions, such as saying 'failure of' instead of 'failure to.'Using 'ain't' in formal writing., Confusing 'that' with 'this' when referring to immediate issues., Using the phrase without context; needs explanation.
Usage notesUse 'failure' to describe a lack of success in a specific endeavor. Avoid in very formal documents unless necessary. In casual conversations, 'failure' can sound heavy; people may prefer 'not succeeding.'This phrase is used in casual speech to indicate something isn't effective. Avoid in formal contexts.

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Failure
That ain't working

Frequently asked questions: Failure vs That ain't working

What's the difference between Failure and That ain't working?

Failure: not succeeding in something That ain't working: That is not functioning or effective.

Which is more formal: Failure and That ain't working?

Failure is the most formal of these.

Which is more common: Failure and That ain't working?

Failure is the most common in everyday English.

Can you show an example of each?

Failure: His failure to meet the deadline cost the company a valuable contract. That ain't working: I tried fixing it, but that ain't working at all.

Can I use Failure and That ain't working interchangeably?

Not always. Failure and That ain't working are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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