of, pertaining to, or characterized by defects or weaknesses

imperfect vision.

not perfect; lacking completeness

imperfect knowledge.

Grammar . noting action or state still in process at some temporal point of reference, particularly in the past.

Law . being without legal effect or support; unenforceable.

Botany . (of a flower) diclinous.

Music . of or relating to the interval of a major or minor third or sixth. Compare perfect ( def. 12a ) .

the imperfect tense.

another verb formation or construction with imperfect meaning.

a form in the imperfect, as Latin port?bam, I was carrying.