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English word faithful comes from Middle English (1100-1500) feithful
feithful (Middle English)
faithful (English)
(in the plural) The practicing members of a religion or followers of a cause.. Someone or something that is faithful or reliable. Consistent with reality.. Engaging in sexual relations only with one's spouse or long-term sexual partner.. Having faith.. Loyal; adhering firmly to person or cause.. Reliable; worthy of trust.