| incessant(adjective, steady) |
| never-failing(adjective, firm, solid, substantial, stable) |
| secure(adjective, firm, solid, stable, fixed) |
| stabile(adjective, firm, solid, steady, substantial) |
| unfaltering(adjective, firm, solid, steady, stable) |
| unfluctuating(adjective, firm, solid, steady, substantial) |
| unqualified(adjective, firm, solid, stable, fixed) |
| unquestioning(adjective, firm, solid, stable, fixed) |
| unremitting(adjective, steady) |
| unshaken(adjective, firm, solid, stable, fixed) |
| abiding(adjective, firm, solid, stable, fixed) |
| allegiant(adjective, firm, solid, stable, fixed) |
| ardent(adjective, firm, solid, stable, fixed) |
| balanced(adjective, firm, solid, stable, fixed) |
| brick-wall(adjective, firm, solid, substantial, stable) |
| calm(adjective, firm, solid, stable, fixed) |
| ceaseless(adjective, steady) |
| certain(adjective, firm, solid, stable, fixed) |
| changeless(adjective, firm, solid, stable, fixed) |
| cool(adjective, firm, solid, stable, fixed) |