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unprofessional /ˌʌnprəˈfɛʃənn̩/  

  • adjective
    [more ~; most ~] :not having or showing the experience, skill, etc., that is expected or appropriate in a person who is trained to do a job well
    She was accused of unprofessional conduct.
    He ran the firm in an unprofessional manner.
    Typos look very unprofessional.