| faithful | (adjective) steadfast in affection or allegiance | - |
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| (adjective) not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend | - |
| (adjective) marked by fidelity to an original | Synonyms: close |
| faithless | (adjective) having the character of, or characteristic of, a traitor | Synonyms: traitorous, treasonable, treasonous, unfaithful |
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| interfaith | (adjective) involving persons of different religious faiths | - |
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| unfaithful | (adjective) not true to duty or obligation or promises | - |
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| (adjective) having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend | - |
| (adjective) having the character of, or characteristic of, a traitor | Synonyms: faithless, traitorous, treasonable, treasonous |
| (adjective) not trustworthy | - |