n. 25B6; noun he is an expert in kendo : SPECIALIST, authority, pundit; adept, maestro, virtuoso, (past) master, wizard; connoisseur, aficionado; informal ace, buff, pro, whizz, hotshot; Brit. informal dab hand; N. Amer. informal maven, crackerjack.
25B6; adjective an expert chess player : SKILFUL, skilled, adept, accomplished, talented, fine; master, masterly, brilliant, virtuoso, magnificent, outstanding, great, exceptional, excellent, first-class, first-rate, superb; proficient, good, able, capable, experienced, practised, knowledgeable; informal wizard, ace, crack, mean.
incompetent.