| certain(adjective, correct, firm, solid, physical) |
| unquestionable(adjective, correct, right, honest, plain) |
| indubitable(adjective, clear, sound, correct, right) |
| positive(adjective, clear, correct, certain, real) |
| indisputable(adjective, certain, confident, undisputed) |
| sure(adjective, clear, sound, correct, firm) |
| undeniable(adjective, clear, correct, right, firm) |
| irrefutable(adjective, clear, flat, firm, solid) |
| undisputed(adjective, certain, straightforward, precise, sure) |
| unquestioned(adjective, certain, straightforward, precise, sure) |
| assured(adjective, certain, straightforward, definite, precise) |
| genuine(adjective, clear, sound, correct, right) |
| incontestable(adjective, certain) |
| real(adjective, clear, sound, correct, right) |
| true(adjective, clear, sound, correct, right) |
| definite(adjective, clear, firm, solid, certain) |
| doubtless(adjective, certain, certainty, undisputed) |
| incontrovertible(adjective, certain) |
| veritable(adjective, sound, correct, right, flat) |
| authentic(adjective, correct, right, flat, honest) |