| casual(adjective, calm, cool, free, simple) |
| extempore(adjective, adverb, free, simple, fake) |
| impromptu(adjective, adverb, free, simple, fake) |
| spontaneous(noun, adjective, free, informal, careless) |
| unpremeditated(noun, adjective, free, informal, careless) |
| unprepared(adjective, free, informal, ready, spontaneous) |
| extemporaneous(noun, adjective, simple, informal, natural) |
| extemporary(adjective, free, informal, casual, impulsive) |
| unstudied(adjective, free, simple, fake, informal) |
| abrupt(adjective, rough, rude, passionate, violent) |
| spur-of-the-moment(noun, adjective, free, prepared, spontaneous) |
| unrehearsed(adjective, free, informal, impulsive, prepared) |
| careless(adjective, calm, cool, passionate, violent) |
| cavalier(adjective, rude, careless, indifferent, fresh) |
| perfunctory(adjective, careless, indifferent, casual, sloppy) |
| offhanded |
| cursory(adjective, careless, indifferent, casual, sloppy) |
| curt(adjective, rough, rude, careless, indifferent) |
| improvised(adjective, free, simple, fake, informal) |
| off the cuff(expression, adjective, idiom, adverb, free) |