improper applies to a broader range of transgressions of rules not only of social behavior but of ethical practice or logical procedure or prescribed method.

What does improper mean? Improper describes something considered unsuitable or inappropriate for the purpose or occasion, as in A ballgown is improper dress for playing basketball.

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.

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 …

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

Improper conditions or methods of treatment are not suitable or good enough for a particular purpose.

Find 3,994 synonyms for improper and other similar words that you can use instead based on 17 separate contexts from our thesaurus.

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; …