- not proper; not strictly belonging, applicable, correct, etc.; erroneous: He drew improper conclusions from the scant evidence.
- not in accordance with propriety of behavior, manners, etc.: improper conduct at a funeral.
- unsuitable or inappropriate, as for the purpose or occasion: improper attire for a formal dance.
- abnormal or irregular: improper functioning of the speech mechanism.
- lacking propriety; not seemly or fitting
- unsuitable for a certain use or occasion; inappropriate
- irregular or abnormal
