| guaranteed(adjective, characteristic, certainty, absoluteness) |
| idiot-proof(adjective, characteristic, certainty, absoluteness) |
| impenetrable(adjective, characteristic, certainty, absoluteness) |
| inalienable(adjective, characteristic, certainty, absoluteness) |
| inbred(adjective, characteristic, certainty, absoluteness) |
| incontestable(adjective, characteristic, certainty, absoluteness) |
| incontrovertible(adjective, characteristic, certainty, absoluteness) |
| indestructible(adjective, characteristic, certainty, absoluteness) |
| indubitable(adjective, characteristic, certainty, absoluteness) |
| infallible(adjective, characteristic, certainty, absoluteness) |
| inherent(adjective, characteristic, certainty, absoluteness) |
| interminable(adjective, characteristic, time, eternity) |
| irrefutable(adjective, characteristic, certainty, absoluteness) |
| natural(adjective, characteristic, certainty, absoluteness) |
| never-failing(adjective, characteristic, certainty, absoluteness) |
| nonnegotiable(adjective, characteristic, certainty, absoluteness) |
| nontransferable(adjective, characteristic, certainty, absoluteness) |
| oft-repeated(adjective, characteristic, time, eternity) |
| perfect(adjective, characteristic, certainty, absoluteness) |
| permanent(adjective, characteristic, time, eternity) |