unfaithful

英 [ʌn'feɪθfʊl; -f(ə)l] 美[ʌn'feθfl]

• adj. 不忠实的；不诚实的；不准确的

1. not true to duty or obligation or promises;

"an unfaithful lover"

2. having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend;

"her husband was unfaithful"

3. deliberately and abominably disloyal or likely to betray trust or confidence;

"the faithless Benedict Arnold"

"a lying traitorous insurrectionist"

4. not trustworthy;

"an unfaithful reproduction"