Meaning of “improper” in the English Dictionary

(Definition of “improper” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"improper" in American English

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us /ɪmˈprɑp·ər/

improper adjective (DISHONEST)

being against a law or a rule; dishonest or illegal:

improper adjective (WRONG)

not suitable or correct for a particular use or situation:

an improper choice of words
adverb us /ɪmˈprɑp·ər·li/

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)

"improper" in Business English

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uk /ɪmˈprɒpər/ us 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.

The chief executive was cleared of acting improperly in selling the shares.

(Definition of “improper” from the Cambridge Business English Dictionary © Cambridge University Press)