imperfect

Concise Oxford English Dictionary © 2008 Oxford University Press:
imperfect/ɪmˈpɜːfɪkt/

▶adjective

• 1 faulty or incomplete.

• 2 Grammar (of a tense) denoting a past action in progress but not completed at the time in question.

• 3 Music (of a cadence) ending on the dominant chord.

• 4 Law (of a gift, title, etc.) transferred without all the necessary conditions or requirements being met.

– derivatives
imperfection noun,
imperfectly adverb.