improper in WordNet English dictionary

1. not suitable or right or appropriate
   "slightly improper to dine alone with a married man"; "improper medication"; "improper attire for the golf course"
   improper 
   
2. not appropriate for a purpose or occasion
   "said all the wrong things"
   improper  wrong 
   
3. not conforming to legality, moral law, or social convention
   "an unconventional marriage"; "improper banking practices"
   improper  unconventional  unlawful