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

Definition of improper adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

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 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 …

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

Nov 30, 2025 · improper (comparative more improper, superlative most improper) Unsuitable to needs or circumstances; inappropriate; inapt. Not in keeping with conventional mores or good manners; …

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

How does the adjective improper differ from other similar words? Some common synonyms of improper are indecorous, indelicate, unbecoming, and unseemly.

It would be improper for me to ask such a favor of her. He made some improper remarks. He came to school improperly dressed. She pronounced the word improperly.