|1.||[ adjective ] not true to duty or obligation or promises|
"an unfaithful lover"
|Related terms:||faithful apostate punic untrue adulterous untrustworthy inconstant fidelity|
|2.||[ adjective ] (sexuality) having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend|
"her husband was unfaithful"
|Related terms:||faithful adulterous adulterous|
|3.||[ adjective ] deliberately and abominably disloyal or likely to betray trust or confidence|
"the faithless Benedict Arnold" "a lying traitorous insurrectionist"
|4.||[ adjective ] not trustworthy|
"an unfaithful reproduction"