| ad lib(expression, adjective, free, create, informal) |
| improv(adjective, free, informal, mock, casual) |
| improviso(adjective, free, informal, mock, casual) |
| ad-lib(verb, adjective, fake, unprepared, unplanned) |
| ad hoc(expression, adjective, free, casual, unrehearsed) |
| at first glance(expression, idiom, free, informal, casual) |
| by ear(expression, adjective, free, informal, casual) |
| dashed off(expression, adjective, fake, mock, affected) |
| expedient(adjective, free, informal, casual, snap) |
| extemporaneous(adjective, fake, unprepared, unplanned, unrehearsed) |
| extempore(adjective, free, unprepared, unplanned, unrehearsed) |
| extemporized(adjective, fake, unprepared, unplanned, unrehearsed) |
| fake(verb, adjective, create, bear, discover) |
| faked(adjective, fake, mock, affected, unprepared) |
| immediate(adjective, free, informal, casual, snap) |
| impromptu(adjective, adverb, free, mock, affected) |
| improvisatory(adjective, free, informal, casual, snap) |
| improvised(adjective, free, unprepared, unplanned, unrehearsed) |
| informal(adjective, free, casual, snap, unrehearsed) |
| jamming(adjective, free, informal, casual, snap) |