| unannounced |
| unplanned(adjective, chance, impulsive, planned, unqualified) |
| casual(adjective, careless, chance, random, arbitrary) |
| hasty(adjective, passionate, violent, fast, quick) |
| rare(adjective, extraordinary, unusual, strange, exceptional) |
| unlooked-for(adjective, surprising, unforeseen, unanticipated, unpredicted) |
| swift(adjective, passionate, violent, fast, quick) |
| abnormal(adjective, unusual, exceptional, special, irregular) |
| amazing(adjective, great, excellent, unusual, strange) |
| bizarre(adjective, obscure, unusual, strange, new) |
| eye-opening(adjective, amazing, shocking, astonishing, astounding) |
| fabulous(great, excellent, superb, super, groovy) |
| marvelous(great, excellent, unusual, strange, superb) |
| quick(adjective, passionate, violent, fast, abrupt) |
| uncommon(adjective, obscure, extraordinary, unusual, strange) |
| unfamiliar(adjective, unusual, strange, new, exceptional) |
| unheralded(adjective, surprising, unforeseen, unanticipated, unpredicted) |
| unpredictable(adjective, passionate, violent, uncertain, thoughtless) |
| charming(great, excellent, superb, super, groovy) |
| lovely(great, excellent, superb, super, groovy) |