Main Entry: in·fi·del

Pronunciation: \ˈin-fə-d^əl, -fə-ˌdel\

Function: noun

Etymology: Middle English infidele, from Middle French, from Late Latin infidelis unbelieving, from Latin, unfaithful, from in- + fidelis faithful — more at fidelity

Date: 15th century

1 : one who is not a Christian or who opposes Christianity
2 a : an unbeliever with respect to a particular religion b : one who acknowledges no religious belief
3 : a disbeliever in something specified or understood

— infidel adjective