| certain(adjective, clear, sound, pure, healthy) |
| checked(adjective, clear, sound, pure, healthy) |
| clear(adjective, pure, healthy, safe, innocuous) |
| competent(adjective, clear, sound, pure, healthy) |
| decontaminated(adjective, clear, pure, healthy, safe) |
| dependable(adjective, clear, sound, pure, healthy) |
| healthy(adjective, clear, sound, pure, safe) |
| innocent(adjective, clear, pure, healthy, safe) |
| innoxious(adjective, clear, sound, pure, healthy) |
| inoffensive(adjective, clear, sound, pure, healthy) |
| neutralized(adjective, clear, sound, pure, healthy) |
| nonpoisonous(adjective, clear, sound, pure, healthy) |
| nontoxic(adjective, clear, sound, pure, healthy) |
| pure(adjective, clear, healthy, safe, innocuous) |
| reliable(adjective, clear, sound, pure, healthy) |
| risk-free(adjective, clear, sound, pure, healthy) |
| riskless(adjective, clear, sound, pure, healthy) |
| secure(adjective, clear, sound, pure, healthy) |
| sound(adjective, clear, pure, healthy, safe) |
| tame(adjective, clear, sound, pure, healthy) |