| extemporary(free, casual, impulsive, spontaneous, unprepared) |
| extemporised(adjective, extemporize, extemporise) |
| extemporized(adjective, informal, spontaneous, unplanned, unpremeditated) |
| factitious(adjective, fake, false, unusual, strange) |
| fairy-tale |
| fantasized(adjective, pretend, imaginary) |
| fantasy(adjective, false, pretend, imaginary, unreal) |
| farraginous |
| fashioned(untrue, developed, fictitious, invented, fabricated) |
| free(casual, impulsive, spontaneous, unprepared, impromptu) |
| hatched |
| hyped up(expression, untrue, developed, fictitious, invented) |
| immediate(free, informal, casual, impulsive, snap) |
| improv(free, informal, casual, impulsive, snap) |
| improvisatory(free, informal, casual, impulsive, snap) |
| improviso(adjective, free, informal, casual, spontaneous) |
| informal(free, casual, impulsive, snap, unprepared) |
| jamming(free, informal, casual, impulsive, snap) |
| made(untrue, developed, fictitious, invented, fabricated) |
| made up(verb, expression, adjective, phrasal verb, fake) |