| offhand(adjective, free, casual, impulsive, prepared) |
| extemporaneous(adjective, free, casual, impulsive, prepared) |
| extempore(adjective, free, casual, impulsive, prepared) |
| impromptu(adjective, free, casual, impulsive, prepared) |
| off-the-cuff(adjective, informal, prepared, spontaneous, unprepared) |
| ad-lib(adjective, free, fake, casual, prepared) |
| improvised(adjective, free, casual, impulsive, prepared) |
| offhanded |
| unrehearsed(adjective, free, casual, impulsive, prepared) |
| unpremeditated(adjective, free, casual, impulsive, spontaneous) |
| unprepared(adjective, free, casual, impulsive, spontaneous) |
| unstudied(adjective, free, casual, impulsive, spontaneous) |
| spur-of-the-moment(adjective, free, casual, impulsive, prepared) |
| ad lib(expression, adjective, free, casual, spontaneous) |
| spontaneous(adjective, free, casual, impulsive, unprepared) |
| unplanned(adjective, free, casual, impulsive, spontaneous) |
| automatic(adjective, free, casual, impulsive, spontaneous) |
| extemporal(adjective, unrehearsed, extemporaneous) |
| makeshift(adjective, free, casual, impulsive, spontaneous) |
| off the cuff(expression, adjective, free, impromptu, improvised) |