| makeshift(free, casual, impulsive, spontaneous, unprepared) |
| off-the-cuff(adjective, spontaneous, unprepared, impromptu, unplanned) |
| offhand(free, casual, impulsive, spontaneous, unprepared) |
| on-the-spot(free, fake, casual, impulsive, spontaneous) |
| on impulse(expression, free, fake, casual, impulsive) |
| snap(free, casual, impulsive, spontaneous, unprepared) |
| spontaneous(free, casual, impulsive, unprepared, impromptu) |
| spur-of-the-moment(adjective, free, casual, impulsive, spontaneous) |
| toss off(expression, free, fake, casual, impulsive) |
| toss out(expression, free, fake, casual, impulsive) |
| unplanned(free, casual, impulsive, spontaneous, unprepared) |
| unpremeditated(free, casual, impulsive, spontaneous, unprepared) |
| unprepared(free, casual, impulsive, spontaneous, impromptu) |
| unrehearsed(free, casual, impulsive, spontaneous, unprepared) |
| unstudied(free, casual, impulsive, spontaneous, unprepared) |
| winging it(expression, free, casual, impulsive, spontaneous) |
| Band-Aid(spontaneous, unplanned, unpremeditated) |
| ad lib(expression, spontaneous, unprepared, impromptu, unplanned) |
| extemporal(unrehearsed, extemporary) |
| extemporized(spontaneous, unplanned, unpremeditated) |