| by ear(expression, adjective, free, casual, unrehearsed) |
| coincidental |
| extemporized(spontaneous, unprepared, unplanned, unrehearsed, unpremeditated) |
| hasty(adjective, quick, impulsive, rash, unthinking) |
| improvisatory(adjective, free, informal, casual, snap) |
| jamming(adjective, free, informal, casual, snap) |
| made-up(adjective, free, informal, casual, spontaneous) |
| makeshift(adjective, free, informal, casual, spontaneous) |
| natural(adjective, impulsive, unprompted) |
| off the top of head(expression, idiom, free, impromptu, unrehearsed) |
| offhanded |
| on-the-spot(adjective, free, informal, casual, snap) |
| on impulse(expression, adjective, free, casual, unrehearsed) |
| played by ear(expression, idiom, unprepared, unplanned, unrehearsed) |
| shot from the hip(expression, idiom, unprepared, unplanned, unrehearsed) |
| sudden(noun, adjective, violent, fierce, quick) |
| taking for ride(expression, free, informal, casual, snap) |
| thought out loud(expression, free, informal, casual, snap) |
| toss off(expression, adjective, free, casual, impulsive) |
| toss out(expression, adjective, free, casual, impulsive) |