Read the dictionary definition of improper. All definitions for this word.
1. not appropriate for a purpose or occasion
1. said all the wrong things
2. not suitable or right or appropriate
1. slightly improper to dine alone with a married man
2. improper medication
3. improper attire for the golf course
3. not conforming to legality, moral law, or social convention
1. an unconventional marriage
2. improper banking practices