History
History
History
UK
US
Meaning:

(especially of behaviour) bad because not obeying the rules or customs of a profession

not done well or skilfully

ignorant improper incompetent inefficient lax negligent unethical amateur amateurish inadequate inexperienced inexpert nonexpert unfitting unsuitable untrained unworthy
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UNPROFESSIONAL as in Wiktionary
UNPROFESSIONAL as in Wikipedia