| accurate(adjective, open, honest, sensible, reliable) |
| devoted(adjective, good, strong, firm, honest) |
| eternal(adjective, continue, certain, steady, fixed) |
| everlasting(adjective, continue) |
| fast(adjective, trustworthy, faithful) |
| fixed(adjective, set, clear, certain, regular) |
| incessant(adjective, strong, continue, firm, determined) |
| perennial(adjective, enduring, perpetual) |
| persisting |
| predictable(adjective, good, strong, solid, steady) |
| sure-fire(adjective, informal, certain, flawless, unquestionable) |
| surefire(adjective, certain, reliable, trustworthy, unquestionable) |
| unchanged(adjective, fixed, even, rigid, uniform) |
| unending(adjective, continue) |
| absolute(adjective, certain, unchanging) |
| honest(adjective, open, sensible, sure, reliable) |
| industrious |
| intact |
| inviolate |
| never-failing(adjective, set, clear, certain, sure) |