Main Entry:
in·fi·del 
Pronunciation:
\ˈin-fə-dəl, -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