What does imperfect mean?
“Imperfect” describes something that is not completely accurate, finished, or flawless. It can refer to a person, an object, a process, or information: an imperfect translation may still convey the main idea, while an imperfect record may contain omissions or errors. The word often carries a measured, practical connotation, suggesting that shortcomings exist without implying that the thing is useless. In grammar, “the imperfect” names a tense or aspect that presents an action as ongoing, habitual, or incomplete in relation to another time. As a noun, an “imperfect” is a failure in the performance of a duty, such as a mistake or omission. The adjective is especially common in discussions of writing, memory, measurement, and processes where exactness matters but minor or significant flaws may remain.
Not perfect, complete, or flawless; affected by error, omission, or lack of full quality.
"The evidence supports an imperfect but reasonable conclusion."
Common in general English for anything lacking a desired degree of accuracy, completion, or excellence.
A failure or error in the performance of a duty or action.
"The report identified several technical imperfections in the procedure."
Usually used in formal or legal contexts; the plural “imperfections” is common.
A grammatical tense or aspect that presents an action as ongoing, habitual, or incomplete in relation to another time.
"The imperfect is used to describe actions that had not reached a clear conclusion."
This sense is primarily grammatical and is especially relevant in the languages that formally distinguish perfective and imperfective aspects.
Used when referring to multiple failures or errors in the performance of a duty or action.
"The audit revealed several serious imperfections in the accounts."
“Imperfect” is the grammatical opposite of “perfect,” but in ordinary use it describes anything that is useful without being flawless.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does imperfect come from?
The English word comes through Old French from Latin imperfectus, formed from in- (“not”) and perfectus (“complete” or “accomplished”). The Latin perfectus itself was associated with perficere, “to finish” or “to complete.” The same Latin family produced perfect, perfection, and imperfection, while related forms in many European languages refer to unfinished, ongoing, or incomplete action.
Related word forms
How imperfect is actually used
In general use, “imperfect” is neutral and often suggests that something is imperfect rather than suggesting that it is seriously defective. In grammar, it refers to actions viewed as ongoing or repeated in relation to another time, especially in languages such as Spanish, French, and Italian.
Easily confused with imperfect
“Imperfect” generally means lacking perfection or completeness, whereas “imperfective” is a grammatical term describing an action viewed as ongoing or repeated rather than as a completed whole.