Indecorous, improper, unseemly, unbecoming, indelicate mean not conforming to what is accepted as right, fitting, or in good taste. Improper adjective (wrong) unsuitable or not correct for a particular use or occasion: Definition of improper adjective in oxford advanced learner's dictionary.
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 attire for a formal dance.
Improper functioning of the speech mechanism. Jan 24, 2026improper (comparative more improper, superlative most improper) unsuitable to needs or circumstances; See example sentences, synonyms, and etymology for the adjective improper.
See examples of improper used in a sentence. Improper is the opposite of proper. Something that’s improper goes against what people think is right.
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