amazing, astonishing, astounding, awesome, awful, eye-opening, fabulous, marvelous(or marvellous), miraculous, portentous, prodigious, staggering, stunning, stupendous, sublime, surprising, wonderful

incomprehensible, inconceivable, incredible, unbelievable, unimaginable, unthinkableextraordinary, phenomenal, rare, sensational, spectacularsingular, uncommon, unique, unusual, unwontedconspicuous, notable, noticeable, outstanding, remarkableimpressive, smashing, strikingmind-bending, mind-blowing, mind-bogglinganimating, energizing, enlightening, enlivening, exciting, galvanizing, invigorating, stimulatingalluring, attracting, attractive, beguiling, bewitching, captivating, charming, enchanting, entertaining, enthralling, fascinating, interesting

unimpressive, uninspiring, unremarkableboring, dull, jading, monotonous, tedious, tiring, uninspired, uninteresting, wearisome, weary, wearyingcommon, customary, mundane, normal, ordinary, typical, unexceptional, usualdraining, enervating, exhausting, fatiguing, wearingdebilitating, enfeeblingdemoralizing, discouraging, disheartening, dispiriting