| extemporaneous(adjective, simple, informal, natural, casual) |
| impromptu(noun, adjective, adverb, free, simple) |
| off-the-cuff(verb, adjective, adverb, produce, simple) |
| unrehearsed(adjective, impulsive, prepared, spontaneous, unprepared) |
| improvise(verb, adjective, make, fix, plan) |
| offhand(adjective, adverb, free, simple, fake) |
| extempore(adjective, adverb, free, simple, fake) |
| extemporize(verb, adjective, planned, invent, compose) |
| improvised(adjective, adverb, free, simple, fake) |
| spontaneous(adjective, impulsive, willing, unprepared, impromptu) |
| unprepared(adjective, free, ready, spontaneous, impromptu) |
| extemporary(adjective, free, fake, casual, prepared) |
| make up(verb, expression, phrasal verb, make, fix) |
| snap(adjective, free, casual, impulsive, prepared) |
| wing it(verb, expression, idiom, phrasal verb, make) |
| fake(verb, create, bear, planned, compose) |
| offhanded |
| spur-of-the-moment(adjective, prepared, spontaneous, unprepared, impromptu) |
| extemporise |
| improvisation(noun, planned, prepared, improvised) |