'Unprofessional' definitions:

Definition of 'unprofessional'

From: WordNet
adjective
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" [ant: professional]

Definition of 'Unprofessional'

From: GCIDE