indecorous, improper, unseemly, unbecoming, indelicate mean not conforming to what is accepted as right, fitting, or in good taste. indecorous suggests a violation of accepted standards of good manners.

IMPROPER definition: not proper; not strictly belonging, applicable, correct, etc.; erroneous. See examples of improper used in a sentence.

1. not proper; not strictly belonging, applicable, or correct: drew improper conclusions. 2. not in accordance with propriety or regulations: improper conduct. 3. abnormal; irregular.

If you describe someone's behaviour as improper, you mean that it is rude or shocking.

Definition of improper adjective from the Oxford Advanced Learner's Dictionary. dishonest, or morally wrong. He had been indulging in improper business practices. She was suspended for improper …

improper adjective (WRONG) unsuitable or not correct for a particular use or occasion: improper prescription of medicines

unsuitable or inappropriate, as for the purpose or occasion: improper attire for a formal dance. abnormal or irregular: improper functioning of the speech mechanism.

Jan 24, 2026 · improper (comparative more improper, superlative most improper) Unsuitable to needs or circumstances; inappropriate; inapt. Not in keeping with conventional mores or good manners; …

Definition of improper. English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels.

Improper definition: Not suited to circumstances or needs; unsuitable.