| unchanged(adjective, dull, flat, boring, fixed) |
| abiding(adjective, firm, solid, certain, steady) |
| even(adjective, calm, smooth, flat, firm) |
| lasting(adjective, firm, certain, steady, stable) |
| rigid(adjective, set, severe, harsh, cruel) |
| static(adjective, severe, harsh, solid, still) |
| unvaried |
| unwavering(adjective, close, smooth, correct, right) |
| equable(adjective, calm, firm, solid, steady) |
| persistent(adjective, firm, certain, steady, stable) |
| resolute(adjective, close, hard, correct, severe) |
| same(adjective, dull, change, smooth, right) |
| set(verb, adjective, severe, firm, harsh) |
| undeviating(adjective, smooth, right, severe, flat) |
| continual(adjective, smooth, right, flat, level) |
| monotonous(adjective, dull, cold, steady, stable) |
| ceaseless(adjective, certain, steady, persistent, constant) |
| inflexible(adjective, moderate, severe, firm, harsh) |
| perennial(adjective, stable, constant, continuous, enduring) |
| stubborn |