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Adjective: unprofessional  ,ún-pru'fe-shu-nul
  1. 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"

See also: amateur, amateurish, inexpert, rookie, unskilled

Antonym: professional