Noun

• S: (n) progressive, progressive tense, imperfect, imperfect tense, continuous tense (a tense of verbs used in describing action that is on-going)

Adjective

• S: (adj) imperfect (not perfect; defective or inadequate) "had only an imperfect understanding of his responsibilities"; "imperfect mortals"; "drainage here is imperfect"
• S: (adj) fallible, frail, imperfect, weak (wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings) "I'm only a fallible human"; "frail humanity"