WordNet sense 1 (of the highest quality):

ace, crack, first-rate, super, tiptop, topnotch, A-one, tops

WordNet sense 2 (of high or superior quality or performance):

superior

WordNet sense 3 (extravagantly fanciful and unrealistic; foolish):

wild

WordNet sense 4 (not realistic):

unrealistic

WordNet sense 5 (existing in fancy only):

fantastical

WordNet sense 6 (lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria):

unreal

WordNet sense 7 (not plain; decorative or ornamented):

fancy

WordNet sense 8 (exceedingly or unbelievably great):

phenomenal

WordNet sense 9 (extraordinarily good; used especially as intensifiers):

grand, howling, marvelous, rattling, terrific, tremendous, wonderful, wondrous, marvellous

WordNet sense 10 (ludicrously odd):

antic, grotesque

WordNet sense 11 (being definitely out of the ordinary and unexpected; slightly odd or even a bit weird):

unusual