| explicit(adjective, strong, complete, flat, total) |
| express(adjective, complete, total, definite, absolute) |
| faithful(adjective, intense, certain, resolute, persistent) |
| flat out(expression, adjective, complete, total, definite) |
| foolproof(adjective, infallible) |
| for a fact(expression, adjective, idiom, clear, certain) |
| free from doubt(expression, adjective, idiom, clear, certain) |
| genuine(adjective, set, clear, complete, warm) |
| hang tough(expression, adjective, strong, certain, definite) |
| immortal |
| immovable(adjective, firm, solid, intense, stable) |
| imperturbable(adjective, firm, solid, stable, fixed) |
| in the bag(expression, adjective, idiom, certain, limited) |
| inalterable(adjective, certain, limited, definite, inflexible) |
| incontestable(adjective, clear, certain, definite, positive) |
| incontrovertible(adjective, clear, certain, definite, positive) |
| indisputable(adjective, clear, certain, definite, positive) |
| indubitable(adjective, clear, certain, definite, positive) |
| inerrant(certain, unquestionable, undisputable) |
| inescapable(certain, unquestionable, undisputable) |