| substantial(adjective, characteristic, calm, good, close) |
| firm(noun, adjective, calm, good, close) |
| sound(noun, verb, adjective, characteristic, calm) |
| strong(adjective, calm, good, person, set) |
| thick(adjective, characteristic, person, close, body) |
| hard(adjective, adverb, person, body, strong) |
| sturdy(adjective, calm, person, body, strong) |
| stable(adjective, good, strong, hard, sound) |
| dense(adjective, characteristic, person, set, body) |
| concrete(adjective, set, hard, tough, correct) |
| secure(verb, adjective, calm, strong, hard) |
| reliable(adjective, calm, strong, reasonable, easy) |
| stout(adjective, calm, person, body, strong) |
| steady(adjective, calm, good, strong, sound) |
| dependable(adjective, good, strong, reasonable, firm) |
| real(adjective, intense, physical, material, pure) |
| good(adjective, strong, great, sound, right) |
| rigid(adjective, strong, hard, complete, secure) |
| tough(adjective, calm, person, body, strong) |
| stiff(adjective, set, strong, hard, secure) |