| certain(adjective, sure, reliable, trustworthy, unquestionable) |
| sure(adjective, solid, certain, definite, constant) |
| infallible(adjective, certain, reliable, trustworthy, dependable) |
| unfailing(adjective, certain, reliable, trustworthy, unquestionable) |
| dependable(adjective, solid, certain, sure, constant) |
| reliable |
| assured(certain, sure, confident, anguished, unquestionable) |
| certainty(noun, belief, trust, confidence, assurance) |
| faithful |
| firm(certain, unquestionable, undisputable, locked, warranted) |
| incontrovertible(adjective, certain, unquestionable, undeniable, undisputable) |
| indubitable(adjective, solid, certain, definite, sure) |
| made |
| secure(adjective, set, solid, certain, sure) |
| solid(certain, sure, reliable, trustworthy, guaranteed) |
| staunch |
| steadfast(certain, reliable, trustworthy, unquestionable, undisputable) |
| steady(certain, unquestionable, undisputable) |
| trustworthy |
| absolute |