unprofessional adjective 3noun 1forms 3 adjective3 •Unbecoming of a professional; hence inappropriate in the workplace.The only real-world effect is that it makes these figures appear boorish and unprofessional to anyone outside the online slopulist echo chamber. — 2025 •Lacking a profession. •Not relating to professional occupation or employment; nonprofessional. noun1 •One who is not a professional. formsunprofessionals · more unprofessional · most unprofessional