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English Vocabulary tips & definition with Gymglish.
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professional: trained, skilled, opposite of amateur; vocational, work-related
Michael Jordan is a professional sportsman.
I need some professional advice. My friends can't help me with this problem.
a professional an expert

professionally: done by a professional; well done, done expertly
As a formula to end a letter, professionally is rarely used. "Sincerely", "Cordially", "Regards" are more common choices for a professional letter.

unprofessional (behavior): (behavior which is) unsuitable or inappropriate for work or business

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