| safe(adjective, unpolluted, dangerous, innocuous, benign) |
| risk-free(adjective, clear, sound, pure, healthy) |
| secure(adjective, clear, sound, pure, healthy) |
| sound(adjective, clear, pure, healthy, safe) |
| dependable(adjective, clear, sound, pure, healthy) |
| harmless(adjective, clear, pure, healthy, safe) |
| reliable(adjective, clear, sound, pure, healthy) |
| unhazardous |
| good |
| stable(adjective, safe, sheltered, protected, locked) |
| steady(adjective, safe, sheltered, protected, locked) |
| firm(adjective, safe, sheltered, protected, locked) |
| innocent(adjective, clear, pure, healthy, safe) |
| innocuous(adjective, clear, pure, healthy, safe) |
| inoffensive(adjective, clear, sound, pure, healthy) |
| solid(adjective, safe, sheltered, protected, locked) |
| sure(adjective, safe, sheltered, protected, locked) |
| trustworthy(adjective, clear, sound, pure, healthy) |
| certain(adjective, clear, sound, pure, healthy) |
| checked(adjective, clear, sound, pure, healthy) |