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English definition of “improper”

improper

adjective  /ɪmˈprɑp·ər/ us  

improper adjective (DISHONEST)

being against a law or a rule; dishonest or illegal: The treasurer denied accepting any improper payments.

improper adjective (WRONG)

not suitable or correct for a particular use or situation: an improper choice of words
improperly
adverb  /ɪmˈprɑp·ər·li/ us  
If handled improperly, some chemicals used for cleaning can cause severe skin irritation.
(Definition of improper from the Cambridge Academic Content Dictionary © Cambridge University Press)
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