bumper

A-OK, A1, awesome, bang-up, banner, beautiful, blue-chip, blue-ribbon, brave, bully, capital, choice, classic, cool [slang], corking, crackerjack, dandy, divine, dynamite, excellent, fab, fabulous, famous, fantastic, fine, first-class, first-rate, first-string, five-star, four-star, frontline, gilt-edged (or gilt-edge), grand, great, groovy, heavenly, high-class, hot, immense, jim-dandy, lovely, marvelous (or marvellous), mean, neat, nifty, noble, par excellence, peachy, prime, prize, prizewinning, quality, sensational, splendid, stellar, sterling, superb, superior, superlative, supernal, swell, terrific, tip-top, top, top-notch, top-of-the-line, topflight, unsurpassed, wonderful

astronomical (also astronomic), colossal, cosmic (also cosmical), elephantine, enormous, galactic, gargantuan, giant, gigantic, grand, herculean, heroic (also heroical), huge, humongous (also humungous), immense, jumbo, king-size (or king-sized), leviathan, mammoth, massive, mega, mighty, monster, monstrous, monumental, mountainous, oceanic, planetary, prodigious, super, supersize, supersized, titanic, tremendous, vast, vasty, walloping, whacking, whopping