| improvised(adjective, adverb, free, impulsive, spontaneous) |
| improviso(adjective, free, informal, mock, casual) |
| snap(adjective, free, informal, casual, unprepared) |
| spontaneously(adverb, impromptu, improv, extemporaneously) |
| spur-of-the-moment(adjective, free, informal, casual, snap) |
| unarranged(adjective, spontaneous, unprepared, unplanned, unrehearsed) |
| ad hoc(expression, adjective, free, informal, casual) |
| at will(expression, adjective, adverb, impulsive, extemporaneous) |
| dash off(verb, expression, fake, improv, improvisate) |
| epigram |
| extemporization |
| fake(verb, adjective, spontaneous, unprepared, impromptu) |
| improv(verb, adjective, adverb, free, informal) |
| make up(verb, expression, make, create, prepare) |
| makeshift(adjective, adverb, free, informal, casual) |
| off-the-cuff(verb, adjective, adverb, produce, bear) |
| off the hip(expression, idiom, adverb, makeshift, spontaneously) |
| off the top of head(expression, idiom, free, informal, casual) |
| play |
| quip |