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.

adjective

excellent , faultless , finished , perfect , pure , unblemished , unflawed

adjective

amiss , below par , bottom-of-barrel , broken , damaged , defective , deficient , disfigured , dud * , faulty , few bugs , garbage * , immature , impaired , incomplete , inexact , injured , junk * , lemon * , limited , low , marred , minus , partial , patchy , rudimentary , schlocky , sick , sketchy , two-bit * , undeveloped , unfinished , unsound , vicious , warped , abortive , blemished , contingent , dilapidated , errable , fallible , flawed , frail , ill , imperfective , inadequate , inchoate , inchoative , lacking , potential , short , suboptimal , substandard , unsatisfactory , wanting