Meaning of “unprofessional” in the English Dictionary

"unprofessional" in British English

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unprofessionaladjective

uk /ˌʌn.prəˈfeʃ.ən.əl/ us /ˌʌn.prəˈfeʃ.ən.əl/

C1 not showing the standard of behaviour or skill that is expected of a person in a skilled job:

Doctor Rivers was charged with unprofessional conduct and improper use of dangerous drugs.

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unprofessionally
adverb uk /ˌʌn.prəˈfeʃ.ən.əl.i/ us /ˌʌn.prəˈfeʃ.ən.əl.i/

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

"unprofessional" in American English

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unprofessionaladjective

us /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” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"unprofessional" in Business English

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unprofessionaladjective

uk /ˌʌnprəˈfeʃənəl/ us

not showing the standard of behaviour or work that is expected of a person doing their job:

unprofessional behaviour/conduct Two employees have been suspended after allegations of unprofessional behaviour.
The tribunal upheld her complaint that he had treated her in an unprofessional manner.

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