Definition of infidel

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< infibulate

infidelity >

in·fi·del    (nf-dl, -dl) KEY 

NOUN:

1. An unbeliever with respect to a particular religion, especially Christianity or Islam.
2. One who has no religious beliefs.
3. One who doubts or rejects a particular doctrine, system, or principle.

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ETYMOLOGY:
Middle English infidele, from Old French, from Latin nfidlis, disloyal : in-, not ; see in-¹ + fidlis, faithful (from fids, faith; see bheidh- in Indo-European roots)