| incommutable |
| indefatigable(adjective, resolute, continuous, perseverance) |
| indomitable(adjective, hard, resolute, rigid, inflexible) |
| intent(adjective, strong, flat, certain, determined) |
| intransigent(adjective, steady, fixed, impassive, inflexible) |
| persevering(adjective, strong, certain, definite, resolute) |
| positive(clear, certain, definite, unquestionable, resolved) |
| relentless(adjective, hard, resolute, rigid, inflexible) |
| settled(adjective, strong, flat, firm, solid) |
| static(set, regular, fixed, constant, rigid) |
| tenacious(adjective, resolute, obstinacy) |
| tough(adjective, calm, strong, solid, substantial) |
| unavoidable(adjective, certain, unquestionable, undisputable, inevitable) |
| unmovable(adjective, certain, limited, definite, fixed) |
| unremitting(adjective, continuous) |
| unshakeable(adjective, resolute) |
| bound(strong, certain, definite, certainty, unquestionable) |
| categorical |
| ceaseless(adjective, continuous) |
| conservative(adjective, moderate, cautious, conventional, traditional) |