adjective (a)

• not characteristic of or befitting a profession or one engaged in a profession

  karakteristik atau tidak cocok profesi atau satu terlibat dalam profesi

  Example:
  Described in unprofessional language so that high school students could understand it.
  Was censured for unprofessional conduct.
  Unprofessional repairs.
  

  Antonym:
  professional
  

  source: wordnet30