| improviso(adjective, free, casual, spontaneous, unprepared) |
| informal(adjective, free, casual, snap, spontaneous) |
| instantaneous(adjective, impulsive) |
| last-minute |
| made-up(adjective, free, informal, casual, snap) |
| oblivious(careless, thoughtless, ignorant, unaware, inconsiderate) |
| off-the-cuff(adjective, chance, spontaneous, unprepared, impromptu) |
| reckless(noun, adjective, careless, casual, thoughtless) |
| scratch |
| subconscious(ignorant, hidden, unconscious, unaware, oblivious) |
| unaware(ignorant, hidden, unconscious, oblivious, subconscious) |
| undeliberate(ignorant, hidden, unconscious, unaware, oblivious) |
| unheeding(adjective, careless, thoughtless, unwise, ignorant) |
| unmindful(careless, thoughtless, ignorant, hidden, unconscious) |
| unthought(unplanned, accidental, inadvertent) |
| winging it(expression, free, violent, casual, unrehearsed) |
| advanced |
| aimless(careless, chance, casual, random, haphazard) |
| aleatory |
| artless |