| reliable(adjective, honest, solid, certain, true) |
| infallible(adjective, certain, sure, flawless, reliable) |
| loyal(adjective, good, strong, honest, solid) |
| constant(adjective, good, change, strong, continue) |
| sure(adjective, certain, true, definite, reliable) |
| certain(adjective, strong, certain, true, sure) |
| unflagging(adjective, strong, continue, firm, certain) |
| dependable(adjective, good, strong, honest, solid) |
| persistent(adjective, strong, continue, firm, certain) |
| trustworthy(adjective, good, strong, honest, solid) |
| foolproof(adjective, infallible) |
| staunch(noun, adjective, good, strong, firm) |
| steadfast(adjective, good, strong, honest, solid) |
| unfaltering(adjective, set, clear, strong, firm) |
| indefatigable(adjective, set, strong, continue, firm) |
| invariable(adjective, change, certain, regular, fixed) |
| steady(adjective, good, strong, firm, honest) |
| tireless(adjective, set, strong, continue, firm) |
| trusty(adjective, good, strong, honest, solid) |
| untiring(adjective, continue, determined, tired, persevering) |