| hanging tough(expression, adjective, firm, determined, usual) |
| husky(adjective, strong, great, right, healthy) |
| immovable(adjective, strong, firm, solid, usual) |
| immutable(adjective, calm, strong, solid, steady) |
| in good health(expression, adjective, idiom, strong, great) |
| intent(adjective, firm, determined, usual, regular) |
| invariable(adjective, calm, strong, solid, steady) |
| inveterate(adjective, firm, determined, usual, regular) |
| iron(adjective, strong, solid, stable, sure) |
| ironclad(adjective, firm, determined, usual, regular) |
| lasting(adjective, calm, strong, solid, steady) |
| locked(adjective, strong, solid, stable, sure) |
| locked in(expression, adjective, firm, determined, usual) |
| nailed(adjective, calm, strong, secure, firm) |
| obstinate(adjective, firm, determined, usual, regular) |
| pat(adjective, firm, determined, usual, regular) |
| perdurable(adjective, calm, strong, solid, steady) |
| permanent(adjective, calm, strong, solid, steady) |
| pigheaded(adjective, firm, determined, usual, regular) |
| poised(adjective, calm, strong, secure, firm) |