| ingenuous(simple, honest, pure, natural, fresh) |
| irrational(adjective, moving, sensitive, touching, exciting) |
| irresistible(adjective, impulsive, willing, unforced, unprompted) |
| jejune(simple, plain, fresh, innocent, sincere) |
| laid-back(adjective, simple, easy, plain, informal) |
| loose(adjective, simple, easy, plain, careless) |
| not taught |
| off the top of one's head |
| ordinary(adjective, simple, reasonable, common, usual) |
| original(simple, plain, fresh, innocent, sincere) |
| precipitate(noun, adjective, thoughtless, impulsive, rash) |
| predetermined |
| random(careless, chance, casual, arbitrary, unplanned) |
| relaxed(adjective, calm, quiet, light, smooth) |
| rushing(adjective, impulsive, rash, unthinking, sudden) |
| spontaneity |
| straightforward(adjective, open, light, simple, easy) |
| swift(adjective, thoughtless, impulsive, rash, unthinking) |
| unasked for(verb, expression, adjective, phrasal verb) |
| unavoidable(adjective, impulsive, willing, unforced, unprompted) |