| ad-lib(free, fake, casual, impulsive, spontaneous) |
| ad hoc(expression, free, casual, impulsive, spontaneous) |
| automatic(free, casual, impulsive, spontaneous, unprepared) |
| by ear(expression, free, fake, casual, impulsive) |
| casual(free, impulsive, spontaneous, unprepared, impromptu) |
| expedient(free, casual, impulsive, spontaneous, unprepared) |
| extemporaneous(adjective, free, casual, impulsive, spontaneous) |
| extemporary(free, fake, casual, impulsive, spontaneous) |
| extempore(free, casual, impulsive, spontaneous, unprepared) |
| fake(free, casual, impulsive, spontaneous, unprepared) |
| free(casual, impulsive, spontaneous, unprepared, impromptu) |
| immediate(free, casual, impulsive, spontaneous, unprepared) |
| impromptu(free, casual, impulsive, spontaneous, unprepared) |
| improv(free, casual, impulsive, spontaneous, unprepared) |
| improvisatory(free, fake, casual, impulsive, spontaneous) |
| improvised(free, casual, impulsive, spontaneous, unprepared) |
| improviso(free, casual, impulsive, spontaneous, unprepared) |
| informal(free, casual, impulsive, spontaneous, unprepared) |
| jamming(free, casual, impulsive, spontaneous, unprepared) |
| made-up(free, casual, impulsive, spontaneous, unprepared) |