Synonyms of unprofessional

Adjective

1. unprofessional (vs. professional), amateurish, amateur, inexpert, unskilled

usage: not characteristic of or befitting a profession or one engaged in a profession; "described in unprofessional language so that high school students could understand it"; "was censured for unprofessional conduct"; "unprofessional repairs"

Definition and meaning of unprofessional (Dictionary)