unprofessional

adjective

1. not professional; not pertaining to or characteristic of a profession.
2. at variance with or contrary to professional standards or ethics; not befitting members of a profession, as language, behavior, or conduct.
3. not belonging to a profession; nonprofessional.
4. not done with professional competence, as a play staged or an opera performed by amateurs; amateurish.
5. Sports. nonprofessional(def 2).

noun

6. a person who is not a professional; amateur.

adjective

1. contrary to the accepted code of conduct of a profession
2. amateur
3. not belonging to or having the required qualifications for a profession

adj.1806, from un- (1) “not” + professional.