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.

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.

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

improper adjective (WRONG) not suitable or correct for a particular use or situation: an improper choice of words

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

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; …

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

It signifies behavior, actions, or conditions that are considered inappropriate, incorrect, or not fitting for a given context or situation. When applied to conduct or manners, it implies a violation of social norms …

Improper refers to something that is not suitable, correct, or appropriate according to rules, laws, social norms or standards. It may refer to behavior, language, actions or even objects that do not conform …