first-class
A1 or A-one (informal) ace (informal) bad (slang) bitchin' (U.S. slang) blue-chip, boffo (slang) brill (informal) brilliant, capital, champion, chillin' (U.S. slang) choice, crack (slang) cracking (Brit. informal) crucial (slang) def (slang) dope (slang) elite, excellent, exceptional, exemplary, first-rate, five-star, great, jim-dandy (slang) marvellous, matchless, mean (slang) mega (slang) outstanding, premium, prime, second to none, sovereign, superb, superlative, the dog's bollocks (taboo slang) tiptop, top, top-class, top-drawer, top-flight, top-notch (informal) topping (Brit. slang) tops (slang) twenty-four carat, very good, world-class, inferior, second-class, second-rate, shocking (informal) terrible, third-rate