Etymology
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unprofessional (adj.)

1806, from un- (1) "not" + professional (adj.).

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Definitions of unprofessional

unprofessional (adj.)
not characteristic of or befitting a profession or one engaged in a profession;
described in unprofessional language so that high school students could understand it
was censured for unprofessional conduct
unprofessional repairs
From wordnet.princeton.edu