Learn how to say Infidelity correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word infidelity:
noun (plural infidelities)
1the action or state of being unfaithful to a spouse or other sexual partner:
her infidelity continued after her marriage
I ought not to have tolerated his infidelities
2disbelief in a particular religion, especially Christianity.
late Middle English (in the senses ‘lack of faith’ and ‘disloyalty’): from Old French infidelite or Latin infidelitas, from infidelis ‘not faithful’ (see infidel)