| abruptly(adverb, right, fast, straight, bang) |
| unexpectedly(adverb, unawares, abruptly, inexpectation, surprisingly) |
| instantaneously(adverb, instantaneity, earliness, inexpectation) |
| quickly(adjective, adverb, now, hastily, unexpectedly) |
| without warning(expression, idiom, adverb, unexpectedly, unawares) |
| out of the blue(expression, idiom, adverb, unexpectedly, abruptly) |
| hastily(adverb, unexpectedly, impulsively, rashly) |
| immediately(adverb, instantaneity, unexpectedly, earliness) |
| surprisingly(adverb, unexpectedly, unawares, ignorantly, inexpectation) |
| all at once(expression, idiom, adverb, instantaneity, unexpectedly) |
| precipitately |
| instantly |
| rapidly(adjective, adverb, hastily, unexpectedly, impulsively) |
| precipitously(adverb, hastily, unexpectedly, impulsively, abruptly) |
| sudden(adjective, adverb, unexpectedly, unawares, abruptly) |
| speedily(adverb, earliness) |
| sharply |
| forthwith(adverb, immediately, unexpectedly, unawares, earliness) |
| impetuously |
| impulsively |