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English definition of “improper”

improper

adjective     /ɪmˈprɒpər/ LAW
dishonest , and not allowed by a rule or by law : The cropland may have been polluted because of improper use of pesticides and fertilizers . improper accounting / payments / trading improper activity / conduct / practices
improperly adverb
(Definition of improper adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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