| rock-solid(adjective, hard, strain, firmness, compact) |
| relentless(adjective, mean, strong, hard, tough) |
| unrelenting(adjective, mean, strong, hard, tough) |
| adamant(adjective, mean, strong, hard, secure) |
| tough(adjective, calm, mean, clear, strong) |
| staunch(noun, adjective, calm, good, close) |
| loyal(adjective, good, close, strong, correct) |
| obstinate(adjective, mean, strong, hard, tough) |
| resolved(adjective, set, severe, harsh, certain) |
| tenacious(adjective, clear, strong, sound, free) |
| sturdy(adjective, calm, strong, hard, sound) |
| unfaltering(adjective, strong, complete, total, solid) |
| secure(verb, adjective, calm, fix, strong) |
| unflinching(adjective, strong, certain, determined, steady) |
| unswerving(adjective, close, strong, tough, correct) |
| sure(adjective, calm, good, close, clear) |
| company(noun, organization, business, person, group) |
| decided(adjective, set, clear, intense, certain) |
| dogged(adjective, mean, strong, hard, tough) |
| established(adjective, definite, strong, state, calm) |