“不稳固”用英语怎么说？

我们和那些政治家之间的关系很不稳固。There is an uneasy relationship between us and the politicians.这项研究犹如建在流沙之上，基础极不稳固。The research seemed founded on quicksand.这项和平条约建于不稳固的基础上.The peace treaty rests on shaky foundations....