| rigid(adjective, set, hard, regular, fixed) |
| unyielding(adjective, strong, hard, steady, resolute) |
| inexorable(adjective, hard, resolute, rigid, inflexible) |
| lasting(adjective, calm, strong, solid, steady) |
| unvarying(adjective, calm, clear, strong, secure) |
| unwavering(adjective, calm, strong, secure, flat) |
| irreversible(adjective, constant, steadfast) |
| inalterable(adjective, certain, limited, definite, fixed) |
| irrevocable(adjective, certain, unquestionable, undisputable, irreversible) |
| resolved(adjective, strong, flat, certain, determined) |
| sure(adjective, calm, strong, secure, flat) |
| unbending(adjective, strong, flat, certain, determined) |
| uncompromising(adjective, complete, secure, certain, true) |
| undeviating(adjective, strong, flat, certain, determined) |
| adamant(adjective, strong, definite, rigid, inflexible) |
| enduring(adjective, calm, strong, secure, flat) |
| hard(adjective, resolute, rigid, inflexible, strict) |
| set(adjective, calm, strong, secure, flat) |
| staunch(adjective, calm, strong, secure, flat) |
| stiff(adjective, set, hard, resolute, rigid) |