was fundamentally unknowable even to his closest friends 
(ROOT (S (VP (VBD was) (ADJP (RB fundamentally) (JJ unknowable)) (PP (ADVP (RB even)) (IN to) (NP (PRP$ his) (JJS closest) (NNS friends))))))
(ROOT (S (VP (VBD ) (ADJP (RB ) (JJ )) (PP (ADVP (RB )) (IN ) (NP (PRP$ ) (JJS ) (NNS ))))))