Adjective
used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value
not suitable to be exchanged
Source: WordNetFaith exalts the human heart, by removing it from the market-place, making it sacred and unexchangeable. Under the jurisdiction of religion our deeper feelings are sacralized, so as to become raw material for the ethical life: the life lived in judgement. Roger Scruton