inconcussible

adjective4

1. •
   Unshakable;
2. •
   Firm; solid.

   • Well, then, the Protestant establishments and the Protestant Bible are to fall together, and the Holy See alone to remain inconcussible. — 1864
3. •
   Unwavering; steadfast.

   • What he called the "pure ether" and "transparent" texture of the triumphant Notion were assertions of the necessary reality, the inconcussible certainty of fact that had become pellucid. — 2013
4. •
   Unassailable; incontrovertible.

   • The judgment has gone forth as valid and inconcussible, in spite of assessors impugning it, who belong to the highest order of religious teachers recognized by the State. — 1865