| spontaneous(adjective, free, impulsive, willing, impulse) |
| extemporaneous(adjective, simple, informal, natural, chance) |
| unrehearsed(adjective, adverb, free, impulsive, prepared) |
| makeshift(adjective, adverb, free, offhand, unprepared) |
| impromptu(adjective, free, simple, fake, informal) |
| jury-rigged(adjective, offhand, makeshift) |
| extempore(adjective, free, simple, fake, informal) |
| offhand(adjective, free, simple, fake, natural) |
| unprepared(adjective, free, ready, spontaneous, unprepared) |
| ad-lib(adjective, adverb, free, simple, fake) |
| extemporary(adjective, free, casual, impulsive, prepared) |
| temporary |
| ad lib(expression, adjective, idiom, adverb, free) |
| off-the-cuff(adjective, adverb, simple, informal, natural) |
| unplanned(adjective, free, simple, fake, informal) |
| unpremeditated(adjective, free, casual, impulsive, impulse) |
| casual(adjective, free, simple, fake, natural) |
| extemporized(adjective, informal, spontaneous, unplanned, unrehearsed) |
| fictitious(adjective, untrue, developed, invented, fabricated) |
| improvise(informal, impulse, unplanned, extemporize, off-the-cuff) |