| equable(adjective, calm, strong, secure, firm) |
| even(adjective, calm, strong, secure, firm) |
| fast(adjective, calm, strong, secure, firm) |
| firm(adjective, calm, strong, secure, solid) |
| fixed(adjective, firm, solid, steady, stable) |
| fixed resistant(expression, adjective, calm, strong, substantial) |
| forceful(adjective, severe, determined, vigorous, stiff) |
| hard-nosed(adjective, severe, stiff, rigid, tight) |
| immutable(adjective, calm, strong, solid, steady) |
| invariable(adjective, calm, strong, solid, steady) |
| iron-fisted(adjective, severe, stiff, rigid, tight) |
| ironclad(adjective, severe, stiff, rigid, tight) |
| lasting(adjective, calm, strong, solid, steady) |
| nailed(adjective, calm, strong, solid, steady) |
| perdurable(adjective, calm, strong, solid, steady) |
| permanent(adjective, calm, strong, solid, steady) |
| poignant(adjective, severe, stiff, rigid, tight) |
| poised(adjective, calm, strong, secure, firm) |
| powerful(adjective, severe, stiff, rigid, tight) |
| reliable(adjective, calm, strong, secure, firm) |