| stunning(great, excellent, superb, super, groovy) |
| swell(great, excellent, superb, super, groovy) |
| unanticipated(great, excellent, superb, super, groovy) |
| undreamt of(verb, expression, adjective, phrasal verb) |
| unforeseen(great, excellent, superb, super, groovy) |
| unique |
| unordinary(adjective, excellent, extraordinary, exceptional, special) |
| unprecedented(excellent, extraordinary, unusual, exceptional, marvelous) |
| unpredicted(great, excellent, superb, super, groovy) |
| unusual(light, excellent, thin, exceptional, marvelous) |
| unutterable(adjective, unspeakable) |
| unwonted(adjective, light, thin, strange, exceptional) |
| welcome(great, excellent, superb, super, groovy) |
| winning(great, excellent, superb, super, groovy) |
| contrary to reason(expression, idiom, impossibility) |
| cryptic(adjective, unfathomable, impenetrable, opaque, unintelligible) |
| fantastical |
| far-fetched(adjective, extraordinary, amazing, doubtful, unlikely) |
| ineffable |
| infrequent(excellent, unusual, special, brilliant, rare) |