| off the top of head(expression, free, informal, casual, snap) |
| on-the-spot(free, informal, casual, impulsive, snap) |
| on impulse(expression, free, informal, casual, unrehearsed) |
| precipitate(passionate, violent, thoughtless, abrupt, impetuous) |
| quick(passionate, violent, thoughtless, abrupt, impetuous) |
| rash(passionate, violent, thoughtless, abrupt, impetuous) |
| snap(free, informal, casual, impulsive, unprepared) |
| spontaneous(free, informal, casual, thoughtless, snap) |
| spur-of-the-moment(adjective, free, informal, casual, impulsive) |
| sudden(passionate, violent, thoughtless, abrupt, impetuous) |
| swift(passionate, violent, thoughtless, abrupt, impetuous) |
| taking for ride(expression, free, informal, casual, snap) |
| thought out loud(expression, free, informal, casual, snap) |
| toss off(expression, free, casual, impulsive, spontaneous) |
| toss out(expression, free, casual, impulsive, spontaneous) |
| tossed off(expression, free, informal, casual, snap) |
| tossed out(expression, free, informal, casual, snap) |
| unconsidered(passionate, violent, thoughtless, abrupt, impetuous) |
| unexpected(passionate, violent, thoughtless, abrupt, impetuous) |
| unmeditated(passionate, violent, thoughtless, abrupt, impetuous) |