'unobtainable，' "unknowable." That which cannot be known， no matter how hard one seeks. In Buddhism， a concrete， unchanging self-entity cannot be found in all of existence （na^vadha^ryate， anupalabdhi）. （2） Impossible， unattainable， unachievable. （3） Non-existent. （4） The disappearance of the attachment to inherent existence.