adj. 25B6; adjective
he scored a superb goal : EXCELLENT, superlative, first-rate, first-class, outstanding, remarkable, marvellous, magnificent, wonderful, splendid, admirable, noteworthy, impressive, fine, exquisite, exceptional, glorious; informal great, fantastic, fabulous, terrific, super, awesome, ace, cool, A1; Brit. informal brilliant, brill, smashing.
a superb diamond necklace : MAGNIFICENT, majestic, splendid, grand, impressive, imposing, awe-inspiring, breathtaking; gorgeous.
poor, inferior.