| certain(adjective, unquestionable, indisputable, unassailable) |
| positive(adjective, certain, unquestionable, indisputable) |
| incontestable(adjective, certain, unquestionable, indisputable) |
| accurate(certain, unquestionable, indisputable, unassailable) |
| beyond question(expression, certain, unquestionable, indisputable) |
| double-checked(certain, unquestionable, indisputable, unassailable) |
| inarguable(certain, unquestionable, indisputable, unassailable) |
| indubitable(adjective, certain, unquestionable, indisputable) |
| invincible(certain, unquestionable, indisputable, unassailable) |
| ironclad(certain, unquestionable, indisputable, unassailable) |
| irrebuttable(certain, unquestionable, indisputable, unassailable) |
| irresistible(certain, demonstration, unquestionable, indisputable) |
| nof ifs ands or buts(expression, certain, unquestionable, indisputable) |
| obvious(certain, unquestionable, indisputable, unassailable) |
| proven(certain, unquestionable, indisputable, unassailable) |
| sure(certain, unquestionable, indisputable, unassailable) |
| unanswerable(adjective, certain, demonstration, unquestionable) |
| unassailable(certain, unquestionable, indisputable, ironclad) |
| unimpeachable(certain, unquestionable, indisputable, unassailable) |
| can bet on it(expression, certain, unquestionable, indisputable) |