| offhand(adjective, adverb, free, simple, fake) |
| unprepared(adjective, adverb, free, ready, spontaneous) |
| extemporaneous(adjective, adverb, simple, informal, natural) |
| extempore(adjective, adverb, free, simple, fake) |
| spontaneous(adjective, adverb, free, impulsive, willing) |
| unrehearsed(adjective, free, impulsive, prepared, spontaneous) |
| extemporary(adjective, free, casual, impulsive, prepared) |
| improvised(adjective, free, simple, fake, informal) |
| unpremeditated(adjective, adverb, free, impulsive, planned) |
| unplanned(adjective, free, simple, fake, informal) |
| ad lib(expression, adjective, idiom, adverb, free) |
| off the cuff(expression, adjective, idiom, adverb, free) |
| ad-lib(noun, adjective, adverb, free, simple) |
| makeshift(adjective, adverb, free, spontaneous, unprepared) |
| off-the-cuff(adjective, adverb, simple, informal, natural) |
| casual(adjective, free, simple, fake, natural) |
| instinctive(adjective, simple, natural, casual, impulsive) |
| spur-of-the-moment(adjective, adverb, free, prepared, spontaneous) |
| unstudied(adjective, adverb, free, simple, fake) |
| improviso(adjective, adverb, free, impulse, spontaneous) |