| unambiguous(adjective, clear, plain, certain, straightforward) |
| unarguable(adjective, unquestionable, indisputable, undeniable, indubitable) |
| unerring(adjective, certain, unquestionable, unequivocal, undisputable) |
| unquestioned |
| assured(adjective, clear, certain, sure, positive) |
| decisive(adjective, clear, plain, certain, sure) |
| factual(clear, certain, sure) |
| firm(adjective, clear, certain, definite, sure) |
| fixed(adjective, clear, certain, definite, unquestionable) |
| infallible(adjective, certain, unquestionable, undisputable) |
| reliable(adjective, certain) |
| solid |
| sound(adjective, certain, definite, unquestionable, indisputable) |
| verifiable(adjective, certain) |
| authoritative(adjective, certain) |
| convinced(adjective, clear, certain, definite, sure) |
| convincing(adjective, clear, certain, definite, positive) |
| doubtless(adjective, clear, certain, definite, positive) |
| explicit(adjective, clear, plain, certain, sure) |
| genuine(adjective, clear, certain, definite, sure) |