| firm(noun, adjective, feature, state, characteristic) |
| persistent(adjective, feature, state, characteristic, strong) |
| steady(adjective, feature, state, move, characteristic) |
| stable(adjective, calm, good, strong, secure) |
| unwavering(adjective, calm, close, strong, secure) |
| stiff(adjective, feature, state, characteristic, strong) |
| constant(adjective, calm, good, close, strong) |
| resolute(adjective, calm, close, clear, strong) |
| strong(adjective, calm, good, tough, easy) |
| unyielding(adjective, clear, strong, secure, tough) |
| rigid(adjective, feature, state, characteristic, secure) |
| consistent(adjective, strong, strain, flat, firm) |
| hard(adjective, feature, state, characteristic, strain) |
| sound(adjective, calm, strong, secure, easy) |
| determined(adjective, good, clear, strong, tough) |
| staunch(noun, adjective, calm, good, close) |
| unfluctuating(adjective, calm, strong, secure, strain) |
| fast(adjective, calm, close, strong, secure) |
| permanent(adjective, calm, strong, secure, strain) |
| stubborn(adjective, characteristic, quality, strong, secure) |