crackerjack

accomplished, ace, adept, compleat, complete, consummate, crack, educated, experienced, expert, good, great, master, masterful, masterly, practiced (also practised), professed, proficient, skilled, skillful, versed, veteran, virtuoso

A-OK, A1, awesome, bang-up, banner, beautiful, blue-chip, blue-ribbon, boffo, bonny (also bonnie) [chiefly British], boss [slang], brag, brave, bully, bumper, capital, choice, classic, cool [slang], corking, cracking, dandy, divine, dope [slang], down [slang], dynamite, excellent, fab, fabulous, famous, fantabulous [slang], fantastic, fine, first-class, first-rate, first-string, five-star, four-star, frontline, gangbusters (also gangbuster), gilt-edged (or gilt-edge), gone [slang], grand, great, groovy, heavenly, high-class, hot, hype [slang], immense, jim-dandy, keen, lovely, marvelous (or marvellous), mean, neat, nifty, noble, number one (also No. 1), numero uno, out-of-sight [slang], par excellence, peachy, peachy keen, phat [slang], prime, primo [slang], prize, prizewinning, quality, radical [slang], righteous [slang], sensational, slick, splendid, stellar, sterling, superb, superior, superlative, supernal, swell, terrific, tip-top, top, top-notch, top-of-the-line, top-shelf, topflight, topping [chiefly British], unsurpassed, wizard [chiefly British], wonderful

ace, adept, artist, authority, cognoscente, connoisseur, dab [chiefly British], dab hand [chiefly British], expert, fiend, geek, guru, hand, hotshot, maestro, master, maven (also mavin), meister, past master, proficient, scholar, shark, sharp, virtuoso, whiz, wizard

beaut, beauty, bee's knees, cat's meow, corker, daisy, dandy, dilly, doozy (or doozie), dream, honey, hot stuff, humdinger, hummer, jim-dandy, knockout, lollapalooza, lulu [slang], nifty, peach, pip, pippin, ripper, ripsnorter, snorter, sockdolager (or sockdologer), standout, sweetheart