Antonyms of adj unprofessional

1 sense of unprofessional

Sense 1
unprofessional (vs. professional) -- (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")

professional (vs. unprofessional) -- (characteristic of or befitting a profession or one engaged in a profession; "professional conduct"; "professional ethics"; "a thoroughly professional performance")

Similarity of adj unprofessional

1 sense of unprofessional

Sense 1
unprofessional (vs. professional) -- (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")
       => amateurish, amateur, inexpert, unskilled -- (lacking professional skill or expertise; "a very amateurish job"; "inexpert but conscientious efforts"; "an unskilled painting")