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English definition of “improper”

improper

adjective (RUDE)    /ɪmˈprɒp.ər/ US  /-ˈprɑː.pɚ/
related to sex in a way that is rude or socially unacceptable: I trust you're not making improper suggestions to my husband!Relating to sex and sexual desireRude and cheeky improperly     /-li/ adverb formal
(Definition of improper adjective (RUDE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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