indissoluble

adj

• ① (物质)不能分解[分离、溶解]的
  • a substance that is indissoluble in water不溶于水中的一种物质

• ② 坚固的,永续的,不变的
  • an indissoluble friendship坚固的友谊
  • They were bound by indissoluble vows.他们为海誓山盟所约束。