Main Entry: in·fi·del·i·ty

Pronunciation: \ˌin-fə-ˈde-lə-tē, -(ˌ)fī-\

Function: noun

Inflected Form(s): plural in·fi·del·i·ties

Date: 15th century

1 : lack of belief in a religion
2 a : unfaithfulness to a moral obligation : disloyalty b : marital unfaithfulness or an instance of it