| off the hip(expression, adjective, idiom, adverb, impromptu) |
| off top of head(expression, adjective, idiom, adverb, informal) |
| offhand(adjective, adverb, free, casual, unrehearsed) |
| on-the-spot(adjective, free, informal, casual, snap) |
| on impulse(expression, adjective, free, informal, casual) |
| snap(adjective, free, informal, casual, unrehearsed) |
| spontaneous(adjective, free, informal, snap, impromptu) |
| spur-of-the-moment(adjective, free, informal, casual, impromptu) |
| spur of the moment(expression, adjective, idiom, adverb, impulsive) |
| taking for ride(expression, idiom, free, informal, casual) |
| thought out loud(expression, idiom, free, informal, casual) |
| tossed off(expression, adjective, free, informal, casual) |
| tossed out(expression, adjective, free, informal, casual) |
| unanticipated(adjective, violent, fast, quick, subitaneous) |
| unpremeditated(adjective, free, informal, casual, impromptu) |
| unprepared(adjective, free, informal, snap, impromptu) |
| unrehearsed(adjective, adverb, free, informal, snap) |
| unstudied(adjective, free, informal, casual, impromptu) |
| winging it(adjective, free, informal, casual, snap) |
| without preparation(expression, adjective, adverb, impromptu, extemporaneous) |