| fake(adjective, free, casual, impulsive, spontaneous) |
| immediate(noun, adjective, free, casual, impulsive) |
| improvisatory(adjective, free, casual, impulsive, impulse) |
| improvise(informal, impulse, unplanned, extemporize, off-the-cuff) |
| involuntary(noun, adjective, simple, passionate, violent) |
| natural(adjective, simple, casual, impulsive, willing) |
| precipitate(noun, thoughtless, impetuous, unwary) |
| quick(noun, thoughtless, impetuous, unwary, transientness) |
| unarranged(adjective, spontaneous, unprepared, unplanned, unrehearsed) |
| unintentional(adjective, simple, natural, chance, casual) |
| unorganized |
| unscripted(adjective, fake, spontaneous, unprepared, impromptu) |
| ad hoc(expression, adjective, idiom, free, informal) |
| brief |
| brisk |
| expedient(adjective, free, casual, impulsive, spontaneous) |
| ill-considered(adjective, impulsive, unprepared) |
| impetuous(noun, adjective, simple, passionate, violent) |
| instantaneous(adjective, impulsive, transientness) |
| reflexive(adjective, impulsive) |