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