| impromptu(adjective, adverb, free, simple, fake) |
| offhand(adjective, adverb, free, simple, fake) |
| extemporaneous(adjective, simple, informal, natural, chance) |
| extemporary(adjective, free, casual, impulsive, prepared) |
| unpremeditated(adjective, free, planned, spontaneous, impromptu) |
| unprepared(adjective, free, spontaneous, impromptu, unplanned) |
| spontaneous(adjective, free, simple, fake, informal) |
| unrehearsed(adjective, free, prepared, spontaneous, impromptu) |
| ad lib(expression, adjective, idiom, adverb, free) |
| ad-lib(adjective, adverb, free, simple, fake) |
| improvised(adjective, free, simple, fake, informal) |
| off-the-cuff(adjective, simple, informal, natural, straightforward) |
| unstudied(adjective, free, simple, fake, natural) |
| off the cuff(expression, adjective, idiom, adverb, free) |
| casual(adjective, free, simple, fake, natural) |
| extemporaneously(adverb, impulse, impromptu) |
| offhanded |
| spur-of-the-moment(adjective, free, prepared, spontaneous, impromptu) |
| unplanned(adjective, free, simple, fake, informal) |
| informal(adjective, free, simple, casual, spontaneous) |