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 …

adjective not proper; not strictly belonging, applicable, correct, etc.; erroneous. He drew improper conclusions from the scant evidence.

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

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

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.

Find 792 different ways to say IMPROPER, along with antonyms, related words, and example sentences at Thesaurus.com.

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

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

There are five meanings listed in OED's entry for the adjective improper, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.