unbridgeable
adjective uk/ʌnˈbrɪdʒ.ə.bəl/ us/ʌnˈbrɪdʒ.ə.bəl/
（分歧）无法弥合的，（差异）无法缩小的
used for describing differences or divisions between people that are so big they will never be made smaller
There is an unbridgeable divide between the country's two main political camps. 这个国家的两大政治阵营之间对立严重，无法调和。