| patient(adjective, strong, firm, determined, steady) |
| perseverant |
| regular(adjective, set, steady, persistent, even) |
| rigid(adjective, set, regular, fixed, constant) |
| round-the-clock(adjective, continue, continual) |
| safe(adjective, good, strong, solid, steady) |
| sedulous |
| timeless(adjective, continue) |
| unfading(fixed, static, unchangeable) |
| abiding(adjective, set, clear, certain, fixed) |
| around-the-clock(adjective, continue) |
| boundless(adjective, certain, unchanging) |
| deadly |
| dedicated(adjective, strong, firm, determined, steady) |
| definite(adjective, good, clear, strong, solid) |
| dyed-in-the-wool(adjective, certain, true, constant, reliable) |
| enduring(adjective, set, clear, certain, steady) |
| guaranteed(adjective, certain, flawless, unquestionable, undisputable) |
| immutable(set, regular, fixed, constant, rigid) |
| imperishable(fixed, continuous, static, unchangeable, everlasting) |