improper Meaning in Cambridge American English Dictionary
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Meaning of "improper" - American English Dictionary

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improperadjective

 us   /ɪmˈprɑp·ər/

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  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)
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