Synonyms: betray, be unfaithful to, do the dirty on, mess around, two-time
Betray
1. 背叛;出賣;對...不忠[(+to)]
That man is capable of betraying his friends.
那家伙會出賣朋友。
2. 泄漏,透露
He would suffer death rather than betray the secret.
他寧死也不肯泄露機密。
3. (無意中)暴露,顯示[(+to)][+wh-]
Her red face betrayed her nervousness.
她漲紅的臉顯示她很緊張。
Unfaithful
1. 不忠實的;不忠于職守的[(+to)]
He is unfaithful to his duty.
他不忠于職守。
2. (對配偶)不忠實的;有外遇的[(+to)]
Her husband is unfaithful to her.
她的丈夫對她不忠實。
3. (翻譯、版本等)不準確的,不可靠的