| spontaneously(adverb, improv, extemporaneously) |
| stopgap(adjective, helping) |
| unarranged(adjective, spontaneous, unprepared, unplanned, unrehearsed) |
| uncontrived(adjective, simple, natural, casual, impulsive) |
| uncontrolled(adjective, simple, natural, casual, impulsive) |
| unexpected(adjective, chance, unqualified, vulnerable, spontaneous) |
| extemporarily |
| fake(adjective, adverb, free, casual, impulsive) |
| ill-considered(adjective, impulsive, unqualified, unprepared, unsuspecting) |
| rough-and-ready(adjective, unprepared) |
| sudden(adjective, unexpected, quickly) |
| undevised(adjective, unprepared) |
| by ear(expression, adverb, free, offhand, unrehearsed) |
| cold(adjective, unqualified, unsuspecting, unready) |
| free(adjective, simple, fake, natural, casual) |
| from the hip(expression, adjective, idiom, simple, natural) |
| hurried |
| improvisatory(free, casual, impulsive, spontaneous, unprepared) |
| jury-rigged |
| made-up(adjective, adverb, free, impulsive, spontaneous) |