| unscripted(adjective, unprepared, impromptu, unplanned, unrehearsed) |
| winged(adjective, informal, unqualified, unprepared, impromptu) |
| ad hoc(expression, free, informal, casual, unrehearsed) |
| at first glance(expression, free, informal, casual, snap) |
| by ear(expression, adjective, adverb, free, casual) |
| casual |
| caught off guard(expression, idiom, unqualified, unsuspecting, unready) |
| dashed off(expression, unprepared, unplanned, unrehearsed) |
| expedient(free, informal, casual, snap, unrehearsed) |
| extemporized(adjective, unprepared, unplanned, unrehearsed) |
| immediate(free, informal, casual, snap, unrehearsed) |
| improvisatory(free, informal, casual, snap, unrehearsed) |
| improviso(adjective, free, informal, casual, snap) |
| jamming(free, informal, casual, snap, unrehearsed) |
| made-up(free, informal, snap, unrehearsed, improvised) |
| not prepared(expression, unqualified, unsuspecting, unready) |
| off the hip(expression, adjective, idiom, adverb, preparation) |
| off the top of head(expression, idiom, free, impromptu, unrehearsed) |
| on-the-spot(free, informal, casual, snap, unrehearsed) |
| on impulse(expression, free, informal, casual, snap) |