| rash(adjective, violent, fast, quick) |
| snappy |
| surprise(adjective, unpredictable, secret, unexpected) |
| uncalculated(adjective, secret, unexpected) |
| unforeseeable(unpredictable, secret, unexpected, liable, dependent) |
| unprepared for(expression, proximately, oversoon) |
| unsuspected(adjective, secret) |
| without warning(adjective, violent, fast, quick, shocking) |
| before appointed time(expression, adjective, adverb, quick, immediate) |
| on short notice(expression, adjective, idiom, quick, immediate) |
| on the dot(expression, adjective, idiom, quick, immediate) |
| overearly(adjective, adverb, quick, immediate, beforehand) |
| oversoon(adjective, adverb, quick, immediate, beforehand) |
| preexistent(adjective, adverb, quick, immediate, beforehand) |
| against all expectation(expression, idiom, inexpectation) |
| against expectation(expression, idiom, inexpectation) |
| beyond expectation(expression, idiom, inexpectation) |
| breakneck(violent, fast, quick) |
| brief(violent, fast, quick) |
| brisk |