1 very good; excellent. "a superb performance" synonyms: excellent, superlative, first-rate, first-class, superior, supreme, outstanding, remarkable, dazzling, marvellous, magnificent, wonderful, splendid, admirable, noteworthy, impressive, fine, exquisite, exceptional, glorious, sublime, perfect, of the first order, of the first water; informalgreat, fantastic, fabulous, stellar, terrific, super, supercalifragilisticexpialidocious, awesome, amazeballs, ace, cool, A1, tip-top; informalbrilliant, brill, smashing, bosting; informalbadass; informalon fleek "he scored a superb goal" 2. impressively splendid. "the Bey of Tunis was building himself a superb mausoleum" synonyms: magnificent, majestic, splendid, grand, impressive, imposing, aweinspiring, breathtaking; gorgeous, choice, resplendent, stately; sumptuous, opulent, lavish, luxurious, deluxe; informalplush, ritzy "a superb diamond necklace"