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If you were looking for infidelity, see here
An infidel is someone who doesn't believe what you believe. The word is almost exclusively used in a religious context and can be summed up more succinctly as - someone who doesn't buy your bullshit. An infidel differs from a heretic in that the infidel's views aren't even close to right while the heretic is generally a believer who's gone a bit astray; however, the punishment for both is generally the same.