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.

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

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. im•prop′er•ness, n.

Find 132 different ways to say IMPROPER, along with antonyms, related words, and example sentences at Thesaurus.com.

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 is the opposite of proper. Something that’s improper goes against what people think is right. This could be a matter of politeness. For example, not giving up your seat for an elderly person is …

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; …

If you describe someone's behavior as improper, you mean it is rude or shocking or in some way socially unacceptable. Such improper behavior and language from a young lady left me momentarily …

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