unprofessional: Meaning and Definition of

un•pro•fes•sion•al

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. nonprofessional (def. 2).

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