Definition of "unsubstitutable" []

• Not substitutable. (adjective)

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• "It is only at the resurrection that the identity of Jesus becomes fully manifest, but is it not as a mythological figure, but the human Jesus, and ‘regarded as an unsubstitutable individual in his own right’, and in this sense is ‘most fully historical’."
• "Those costs are completely alien to the wind and solar industry, unless you can find me a rare “unsubstitutable” resource that only exists in an enemy nation."
• "Lumping together (to cite just a few of scores of possible examples) highly substitutable but relatively limited resources of liquid crude oil with unsubstitutable but immense deposits of sedimentary phosphate rocks, or short-lived atmospheric gases with long-lived radio - active wastes, struck me as extraordinarily meaningless."