负    心    [break friendship or love with sb.especially refer to transfer ones love to somebody else;fail one's beloved] 违背良心;背弃情义

贬义词。一般指爱情不专一，违背良心，背弃承诺和情义，移情别恋的行为。

负乘致寇    负荆谢罪    负老携幼    负心违愿    负驽前驱