Imperfect

Not perfect; not complete in all its parts; wanting a part; deective; deficient.

Wanting in some elementary organ that is essential to successful or normal activity.

Not fulfilling its design; not realizing an ideal; not conformed to a standard or rule; not satisfying the taste or conscience; esthetically or morally defective.

The imperfect tense; or the form of a verb denoting the imperfect tense.

To make imperfect.

a tense of verbs used in describing action that is on-going