be unfaithful to編輯正在努力提供更完整的內容，建議 20 分鐘後再回來看看be unfaithful tobe unfaithful to — 動詞動詞1. to cheat or betray, especially in a romantic relationship1.動詞釋義背叛to cheat or betray, especially in a romantic relationship例句He was unfaithful to his wife with her best friend.