flawed, defective, or incomplete; not perfect
relating to or denoting a verb tense expressing a continuing state or an incomplete action, esp in the past
said of a flower: having only stamens or a pistil
said of a cadence in music: ending on a dominant chord
not legally enforceable
imperfectly adv
imperfectness noun
[Middle English imperfit via French from Latin imperfectus, from in-1 + perfectus: see perfect1]