| ignorant(adjective, open, simple, easy, real) |
| impetuous(adjective, simple, natural, casual, impulsive) |
| inartificial(adjective, open, simple, easy, real) |
| inevitable(adjective, simple, natural, casual, impulsive) |
| innocent(adjective, open, simple, easy, plain) |
| irresistible(adjective, simple, natural, casual, impulsive) |
| laid-back(adjective, simple, easy, real, genuine) |
| makeshift |
| naive(adjective, open, simple, easy, plain) |
| off-the-cuff(adjective, simple, natural, casual, impulsive) |
| off top of head(expression, adjective, idiom, simple, natural) |
| offhand(adjective, simple, natural, casual, impulsive) |
| outspoken |
| precipitate |
| primitive(adjective, open, simple, easy, real) |
| provincial(adjective, open, simple, easy, real) |
| real(adjective, open, smooth, simple, easy) |
| rough-and-ready |
| rustic(adjective, open, simple, easy, real) |
| simplehearted(adjective, open, simple, easy, real) |