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inviolable; imperishable; indissoluble; infrangible; ironclad; irreversible; indestructible; sacrosanct (Юрий Гомон); indefeasible; inviolate (об обещании Баян); affording safety; insoluble (President Vladimir V. Putin of Russia has long maintained that Ukraine and Russia are effectively one country, with insoluble historic and cultural ties.  nytimes.com); unbreakable (Tequilaphazzz); iron-clad (Therian); indefectible; irrevocable | |||
| unfailing (friendship); indefatigable | |||
| Stygian (о клятве) | |||
| sacred | |||
| aere perennius | |||
| firm | |||
| indeficient | |||
| aere perennius (Latin for "more lasting than bronze") | |||
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| sacredly | |||
| нерушимый: 51 phrases in 10 subjects |
| Christianity | 2 |
| Diplomacy | 6 |
| General | 30 |
| Historical | 1 |
| Idiomatic | 1 |
| Makarov | 3 |
| Military | 2 |
| Politics | 4 |
| Religion | 1 |
| Slang | 1 |