1. (

• improper

) not suitable or right or appropriate; "slightly improper to dine alone with a married man"; "improper medication"; "improper attire for the golf course" ;

2. (

• improper ,
• unconventional ,
• unlawful

) not conforming to legality, moral law, or social convention; "an unconventional marriage"; "improper banking practices" ;

3. (

• improper ,
• wrong

) not appropriate for a purpose or occasion; "said all the wrong things" ;