Another word for unconquerable

Baxter was possessed by an unconquerable belief in the power of persuasive argument.
His image was carried in the pompa circensis amongst those of the immortal gods, and his statue set up in the temple of Quirinus with the inscription "To the Unconquerable God."
In spite of all, the dominant fact remains, that to the end he was zealous for his God and for the salvation of his people, nay, of the whole of humanity, and that he never lost the unconquerable certainty of his divine mission.
However that may be, he soon repudiated this Danish princess, for whom he seems to have conceived an unconquerable aversion on the very morrow of his marriage to her, and in 1196, in defiance of the pope, who had refused to nullify his union with Ingeborg, married Agnes daughter of Bertold IV., duke of Meran.
But the unfortunate prince had to choose between dependence and extermination, for his unaided resources were powerless against the persistent attacks of the unconquerable The Prussians.

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