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