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English definition of “unprofessional”

unprofessional

adjective    /ˌʌn·prəˈfeʃ·ə·nəl/
not showing the standard of behavior or skills that are expected of a person in a skilled job : Dressing like that was very unprofessional of him.
(Definition of unprofessional adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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