n. 25B6; noun the pianist is clearly a virtuoso : GENIUS, expert, (past) master, maestro, artist, prodigy, marvel, adept, professional, doyen, veteran; star, champion; informal hotshot, wizard, pro, ace; Brit. informal dab hand.
duffer.
25B6; adjective a virtuoso violinist : SKILFUL, expert, accomplished, masterly, master, consummate, proficient, talented, gifted, adept, able, good, competent, capable; impressive, outstanding, exceptional, magnificent, supreme, first-rate, brilliant, excellent; informal superb, mean, ace.
incompetent.