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English definition of “unprofessional”

unprofessional

adjective  /ˌʌn·prəˈfeʃ·ə·nəl/ us  
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 from the Cambridge Academic Content Dictionary © Cambridge University Press)
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