well-advanced or competent in any art, science, or subject; skilled

a proficient swimmer.

an expert.

adjective

clumsy , incompetent , inept , unable , unskilled

adjective

accomplished , adept , apt , capable , clever , competent , consummate , conversant , crack * , crackerjack * , drilled , effective , effectual , efficient , exercised , experienced , expert , finished , gifted , on the beam , phenom , pro , qualified , savvy * , sharp , skillful , slick * , talented , trained , up to speed , versed , whiz * , with it * , crack , master , masterful , masterly , professional , skilled , able , contour , outline , silhouette

noun

ace , adept , authority , dab hand , master , past master , professional , wizard