| extemporaneous(adjective, adverb, impulsive, prepared, spontaneous) |
| impromptu(adjective, free, impulsive, prepared, spontaneous) |
| offhand(adjective, adverb, free, impulsive, prepared) |
| extempore(adjective, free, prepared, spontaneous, impromptu) |
| improvised(adjective, adverb, free, impulsive, prepared) |
| spontaneous(adjective, free, impulsive, unprepared, impromptu) |
| ad-lib(adjective, adverb, impulsive, prepared, spontaneous) |
| extemporary(adjective, free, casual, impulsive, prepared) |
| unprepared(adjective, free, ready, spontaneous, impromptu) |
| ad lib(expression, adjective, idiom, adverb, free) |
| off the cuff(expression, adjective, idiom, adverb, free) |
| impulsive(adjective, impulsive, spontaneous, unplanned, unprompted) |
| off-the-cuff(adjective, adverb, informal, impulsive, prepared) |
| spur-of-the-moment(adjective, free, prepared, spontaneous, unprepared) |
| unplanned(adjective, free, informal, casual, unqualified) |
| unpremeditated(adjective, free, impulsive, spontaneous, unprepared) |
| unstudied(adjective, free, casual, impulsive, spontaneous) |
| offhanded |
| makeshift(adjective, free, informal, casual, spontaneous) |
| unscripted(adjective, spontaneous, unprepared, impromptu, unplanned) |