interminable
/inteɾmiˈnable/ · B2 · adj
interminable
♾️⏳ in- (not) + terminable (able to end) = cannot be ended
Break it into three parts: in- means not, termin- means end (like terminate or terminal), and -able means can be. So interminable is not able to be ended. The English cognate is also interminable.