| incontrovertible(definite, precise, sure, decisive, final) |
| indisputable(definite, precise, sure, decisive, final) |
| irrefragable(adjective, definite, precise, sure, decisive) |
| irrefrangible(adjective, definite, precise, sure, decisive) |
| irrefutable(definite, precise, sure, decisive, final) |
| irrevocable(definite, precise, sure, decisive, final) |
| litmus |
| resolving(definite, precise, sure, decisive, final) |
| revealing(definite, precise, sure, decisive, final) |
| rule |
| settling(definite, precise, sure, decisive, final) |
| straight out(expression, adjective, definite, precise, sure) |
| telling(definite, precise, sure, decisive, final) |
| touchstone(noun, trial) |
| ultimate(definite, precise, sure, decisive, final) |
| unambiguous(definite, precise, sure, decisive, final) |
| unanswerable(adjective, definite, precise, sure, decisive) |
| unarguable(adjective, definite, precise, sure, decisive) |
| unconditional(definite, precise, sure, decisive, final) |
| undeniable(definite, precise, sure, decisive, final) |