unfaith

noun

1. (uncountable, usually)Absence of faith.

   “The true religion occupies the happy mean between miserable unfaith, on the one hand, and timorous superstition, wild fanaticism, and pietistical zeal on the other.”

   “But schooling and native shrewdness had raised up in the younger men an unfaith in old usages, so judgment halted between sentence and execution.”

   “Remember old years and do not break your oath with me, Jehane, since God abhors nothing so much as unfaith.”