| unquestioned |
| authoritative(clear, sound, reasonable, certain, rational) |
| beyond doubt(expression, adjective, idiom, solid, certain) |
| cocksure(adjective, clear, certain, sure, guaranteed) |
| convinced(adjective, clear, certain, sure) |
| flawless |
| good(sound, reasonable, rational) |
| hard(adjective, clear, certain, true, sure) |
| peremptory(adjective, authoritative, overbearing) |
| reliable |
| sound(clear, reasonable, material, certain, rational) |
| unambiguous(adjective, clear, certain, definite, precise) |
| unarguable(adjective, definite, precise, sure, decisive) |
| weighty(sound, reasonable, rational) |
| actual(clear, material, certain, definite, sure) |
| authentic(sound, reasonable, material, certain, rational) |
| beyond question(expression, adjective, idiom) |
| categorical(adjective, clear, certain, definite, sure) |
| clear-cut(adjective, clear, solid, certain, definite) |
| cogent(sound, reasonable, rational, definite, precise) |