unfaithful
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(a) not true to duty or obligation or promises
- an unfaithful lover
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(a) having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
- her husband was unfaithful
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(s) having the character of, or characteristic of, a traitor
- the faithless Benedict Arnold
- a lying traitorous insurrectionist
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(s) not trustworthy
- an unfaithful reproduction