| imperturbable(adjective, characteristic, trait, description) |
| iron-willed(adjective, strong, character, will) |
| not easily disturbed(adjective, characteristic, trait, description) |
| obdurate(adjective, characteristic, trait, description) |
| resolved(adjective, characteristic, trait, description) |
| stable(adjective, characteristic, trait, description) |
| staunch(adjective, characteristic, trait, description) |
| steadfast(adjective, characteristic, trait, description) |
| steady(adjective, characteristic, trait, description) |
| strong(adjective, characteristic, trait, description) |
| strong willed(adjective, strong, character, will) |
| undeviating(adjective, characteristic, trait, description) |
| unruffled(adjective, characteristic, trait, description) |
| unshaken(adjective, characteristic, trait, description) |
| unwavering(adjective, characteristic, trait, description) |
| unyielding(adjective, characteristic, trait, description) |
| withstand(verb, resistance, enduring, withstanding) |
| tenacity(noun, characteristic, quality, ability) |