| imperative(adjective, essential, prime, main, necessary) |
| consequential(adjective, important, essential, main, chief) |
| constitutive(adjective, important, significant, substantial, essential) |
| critical(adjective, main, principal, predominant) |
| elementary(adjective, original, primary, initial, pristine) |
| inherent(adjective, base, basic, key, main) |
| intrinsic(adjective, base, basic, key, main) |
| momentous(adjective, important, essential, main, chief) |
| pivotal(adjective, base, basic, key, main) |
| preeminent(adjective, important, essential, main, chief) |
| primordial(adjective, base, basic, key, main) |
| substantial(adjective, base, basic, key, main) |
| uppermost(adjective, important, essential, main, chief) |
| weighty(adjective, important, essential, main, chief) |
| arch(adjective, important, essential, main, chief) |
| champion(adjective, important, essential, main, chief) |
| effective(adjective, important, essential, main, chief) |
| especial(adjective, important, essential, main, chief) |
| grand(adjective, important, essential, main, chief) |
| highest(adjective, important, essential, main, chief) |