proficient UK /pɹəˈfɪʃ.ənt/US /pɹoʊˈfɪʃ.ənt/adjective 1noun 1forms 3 adjective1 •Good at something; skilled; fluent; practiced, especially in relation to a task or skill.He was a proficient writer with an interest in human nature. noun1 •An expert.Why not subpoena as well the clerical proficients? — 1924 formsproficients · more proficient · most proficient