Inoppugnable

two inoppugnable reasons

Moreover, as this inoppugnable Propensity to Religion is a Cyon of God's own ingraffing on the Mind of Man, so also is it out of his power, tho' assisted by all the hellish Stratagems, totally to eradicate it thence.

I am glad to see, in your account of miscellaneous reading, authors of such inoppugnable orthodoxy as Coleridge and Carlyle.

Do not argue with me. Argue with these stones. / Truth has no trouble in knowing itself. / That is it. The hard fact. The inoppugnable reality, / Here is something for you to digest. / Eat this and we'll see what appetite you have left / For a world hereafter.

… the disease … will be so violent and inoppugnable by the force of Nature, that the Temperament of Peters body … will thereby be dissolved, and so Death shall invevitably succeed.

The barrier vast and inoppugnable [sc. a mountain range]