Read the dictionary definition of imperfect. All definitions for this word.
1. a tense of verbs used in describing action that is on-going
2. wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings
1. I'm only a fallible human
2. frail humanity
3. not perfect; defective or inadequate
1. had only an imperfect understanding of his responsibilities
2. imperfect mortals
3. drainage here is imperfect