| straightaway(adverb, straight, first, directly, immediately) |
| unexpectedly(adverb, suddenly, inexpectation) |
| all at once(expression, idiom, adverb, haste, instantaneity) |
| at short notice(expression, idiom, directly, immediately, rapidly) |
| away(directly, immediately, rapidly, instantly) |
| early(haste, instantaneity) |
| extempore(instantaneity, earliness) |
| fleetingly(adverb, transiently) |
| in a trice(expression, idiom, adverb, instantaneity) |
| in nothing flat(expression, idiom, directly, immediately, rapidly) |
| incontinently |
| just then(expression, idiom, instantaneity) |
| now(adverb, straight, directly, immediately, rapidly) |
| on the dot(expression, idiom, directly, immediately, rapidly) |
| on the instant(expression, idiom, earliness) |
| precipitously(adverb, suddenly) |
| straight off(verb, expression, adverb, phrasal verb, directly) |
| summarily(first, now, directly, immediately, rapidly) |
| thereupon(first, now, directly, immediately, rapidly) |
| this instant(expression, adverb, directly, immediately, rapidly) |