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1. Not suited to circumstances or needs; unsuitable: improper shoes for a hike; improper medical treatment.
2. Not in keeping with conventional mores; indecorous: improper behavior; an improper suggestion. See Synonyms at unseemly.
3. Not consistent with established truth, fact, or rule; incorrect: improper grammar; an improper conclusion.
4. Irregular or abnormal: complications due to improper functioning of the immune system.
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|Noun||1.||improperness - an improper demeanor|
demeanor, demeanour, deportment, behaviour, conduct, behavior - (behavioral attributes) the way a person behaves toward other people
incorrectness - lack of conformity to social expectations
indelicacy - the trait of being indelicate and offensive
indecency - the quality of being indecent