| 1. | not proper; not strictly belonging, applicable, correct, etc.; erroneous: He drew improper conclusions from the scant evidence. |
| 2. | not in accordance with propriety of behavior, manners, etc.: improper conduct at a funeral. |
| 3. | unsuitable or inappropriate, as for the purpose or occasion: improper attire for a formal dance. |
| 4. | abnormal or irregular: improper functioning of the speech mechanism. |