un ‧ pro ‧ fes ‧ sion ‧ al /ˌʌnprəˈfeʃ ə nəl◂/ BrE AmE adjective
[ Word Family: noun : ↑ profession , ↑ professional , ↑ professionalism ; adverb : ↑ professionally , ↑ unprofessionally ; adjective : ↑ professional ≠ ↑ unprofessional ]
behaving in a way that is not acceptable in a particular profession:
Johnson was fired for unprofessional conduct.
—unprofessionally adverb