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.
ETYMOLOGY:
Middle English infidele, from Old French, from Latin nfidlis, disloyal : in-, not; see in–1 + fidlis, faithful (from fids, faith; see bheidh- in Appendix I).
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nfid
lis, disloyal : in-, not; see in–1 + fid
