Synonyms: unprofessional
Definition: not characteristic of or befitting a profession or one engaged in a profession
Usage: described in unprofessional language so that high school students could understand it; was censured for unprofessional conduct; unprofessional repairs
Similar words: unskilled, amateur, amateurish, inexpert
Definition: lacking professional skill or expertise
Usage: a very amateurish job; inexpert but conscientious efforts; an unskilled painting