| ad libitum(expression, adjective, informal, unplanned, extemporize) |
| as one thinks best(expression, adjective, informal, unplanned, extemporize) |
| as one wishes(expression, adjective, informal, unplanned, extemporize) |
| at will(expression, adjective, informal, unplanned, extemporize) |
| casual |
| caught short |
| dashed off(expression, fake, unprepared, unplanned, unrehearsed) |
| extemporary |
| fake(unprepared, unplanned, unrehearsed, unscripted) |
| faked(fake, unprepared, unplanned, unrehearsed, winged) |
| haphazard |
| hasty |
| improv(fake, unprepared, unplanned, unrehearsed, unscripted) |
| improvise(adjective, informal, unplanned, extemporize, off-the-cuff) |
| improviso(fake, spontaneous, unprepared, unplanned, unrehearsed) |
| informal(adjective, unplanned, off-the-cuff) |
| made-up(adjective, informal, spontaneous, unplanned, unpremeditated) |
| natural |
| off-the-cuff(adjective, informal, spontaneous, unprepared, unplanned) |
| played by ear(expression, fake, unprepared, unplanned, unrehearsed) |