| unprompted(adjective, sudden, not expected, not planned) |
| unscripted(adjective, sudden, not expected, not planned) |
| unsuspected(adjective, sudden, not expected, not planned) |
| untimely(adverb, sudden, not expected, not planned) |
| untoward(adjective, sudden, not expected, not planned) |
| unwitting(adjective, sudden, not expected, not planned) |
| abrupt(adjective, sudden, not expected, not planned) |
| against all odds(expression, idiom, surprise, suddenly, not expected) |
| against the odds(expression, idiom, surprise, suddenly, not expected) |
| all at once(expression, idiom, surprise, suddenly, not expected) |
| all of a sudden(expression, idiom, surprise, suddenly, not expected) |
| as the spirit moves(expression, idiom, surprise, suddenly, not expected) |
| at the drop of a hat(expression, idiom, surprise, suddenly, not expected) |
| come out of left field(expression, idiom, surprise, suddenly, not expected) |
| from nowhere(expression, idiom, surprise, suddenly, not expected) |
| if the spirit moves(expression, idiom, surprise, suddenly, not expected) |
| it's just one of those things(expression, idiom, surprise, suddenly, not expected) |
| just like that(expression, idiom, surprise, suddenly, not expected) |
| make something up as you go along(expression, idiom, surprise, suddenly, not expected) |
| on autopilot(expression, idiom, surprise, suddenly, not expected) |