| expedient(adjective, free, informal, casual, snap) |
| extemporary(adjective, free, fake, casual, impulsive) |
| fake(adjective, free, casual, impulsive, spontaneous) |
| free(adjective, informal, casual, impulsive, unprepared) |
| immediate(adjective, free, informal, casual, snap) |
| improvisate |
| informal(adjective, free, casual, impulsive, snap) |
| jamming(adjective, free, informal, casual, snap) |
| made-up(adjective, free, informal, casual, snap) |
| makeshift(adjective, free, informal, casual, snap) |
| off the cuff(adjective, free, informal, casual, snap) |
| off the top of head(expression, idiom, free, informal, casual) |
| offhand(adjective, free, informal, casual, impulsive) |
| snap(adjective, free, informal, casual, impulsive) |
| spur-of-the-moment(adjective, free, informal, casual, snap) |
| taking for ride(expression, idiom, free, informal, casual) |
| thought out loud(expression, idiom, free, informal, casual) |
| toss off(expression, adjective, free, fake, casual) |
| toss out(expression, adjective, free, fake, casual) |
| tossed off(expression, adjective, free, informal, casual) |