| ingenuous(adjective, honest, innocent, artless, unworldly) |
| unaffected(adjective, honest, plain, innocent, artless) |
| artless(adjective, honest, plain, innocent, impulsive) |
| callow(adjective, artless) |
| candid(adjective, honest, plain, innocent, artless) |
| frank(adjective, honest, plain, innocent, artless) |
| honest(adjective, plain, innocent, artless, unworldly) |
| naive(adjective, honest, plain, innocent, artless) |
| natural(adjective, simple, honest, plain, casual) |
| open(adjective, honest, plain, innocent, artless) |
| plain(adjective, honest, innocent, artless, unworldly) |
| sincere(adjective, honest, plain, innocent, artless) |
| straightforward(adjective, honest, plain, innocent, artless) |
| trusting(adjective, honest, plain, innocent, artless) |
| undisguised(adjective, honest, plain, innocent, artless) |
| unsophisticated(adjective, simple, honest, plain, natural) |
| ad-lib(adjective, simple, natural, casual, impulsive) |
| automatic(adjective, simple, natural, casual, impulsive) |
| blunt(adjective, artless) |
| break loose(expression, adjective, simple, natural, casual) |