seem motivated by nothing short of dull , brain-deadening hangover 
(ROOT (VP (VB seem) (VP (VBN motivated) (PP (IN by) (NP (NP (NN nothing)) (ADJP (JJ short) (PP (IN of) (NP (JJ dull) (, ,) (ADJP (NN brain) (HYPH -) (JJ deadening)) (NN hangover)))))))))
(ROOT (VP (VB ) (VP (VBN ) (PP (IN ) (NP (NP (NN )) (ADJP (JJ ) (PP (IN ) (NP (JJ ) (, ) (ADJP (NN ) (HYPH ) (JJ )) (NN )))))))))