Remarkable
rare, extraordinary, strange, outstanding, great, uncommon, special, distinguished, prominent, important, noteworthy, awe-inspiring, awesome, unique, fine, unheard of, unexpected, seldom met with, surprising, superior, astonishing, amazing, prodigious, incredible, inconceivable, atypical, conspicuous, exceptional, eminent, significant, memorable, renowned, refreshing, singular, fabulous, unprecedented, unparalleled, unexampled, unaccountable, stupendous, unaccustomed, wonderful, notable, superior, marvelous, striking, overpowering, electrifying, dazing, fantastic, startling, astounding, indescribable, appalling, stupefying, ineffable, sui generis (Latin), out of sight*.
Antonyms common*, familiar, customary.
Different
unique, extreme, uncommon, particular, exaggerated, distinctive, choice, little-known, out of the ordinary, marked, forward, unconventional, radical, exceptional, peculiar, strange, foreign, outré, unnatural, puzzling, perplexing, confounding, disturbing, novel, advanced, startling, shocking, staggering, uncustomary, breaking with tradition, infrequent, mysterious, mystifying, surprising, extraordinary, unparalleled, deep, profound, aberrant, singular, unorthodox, uncomfortable, not to be expected, eccentric, unbalanced, unclassifiable, unprecedented, inconsistent, individual, original, refreshing, newfangled, new, modern, recent, late, fresh, curious, unfamiliar, irregular, odd, unaccountable, alien, queer, unwonted, off-the-wall*, quaint, freakish, bizarre, farfetched, neurotic, exotic, outlandish, old-fashioned, out of-the-way, abnormal, irrational, monstrous, anomalous, fearful.
Antonyms common*, ordinary, normal.