| critical(adjective, big, important, significant, substantial) |
| desirable(wanted, needed) |
| inexorable(adjective, certain, cruel, obvious, pitiless) |
| prime(adjective, body, material, important, significant) |
| assured(adjective, certain, regular, expected, inexorable) |
| incumbent(adjective, obligatory) |
| de rigueur(expression, adjective, right, essential, required) |
| decisive(adjective, important, substantial, valuable, essential) |
| demanded |
| fated(adjective, certain, obvious, expected, inexorable) |
| infallible(adjective, certain, inevitable) |
| momentous(adjective, important, substantial, valuable, essential) |
| paramount(adjective, important, significant, original, substantial) |
| staple |
| sure(certain, definite, obvious, expected, unquestionable) |
| central(adjective, important, significant, original, essential) |
| conclusive(adjective, demonstration, decisive, required, obligatory) |
| constraining(adjective, required, obligatory) |
| demand(noun, want, need, essential, certainty) |
| desideratum(noun, want, need, essential, certainty) |