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steadfast in affection or allegiance;
"years of faithful service"
"faithful employees"
"we do not doubt that England has a faithful patriot in the Lord Chancellor"
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marked by fidelity to an original;
"a close translation"
"a faithful copy of the portrait"
"a faithful rendering of the observed facts"
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not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend;
"he remained faithful to his wife"