if unintentionally dull in its lack of poetic frissons 
(ROOT (SBAR (IN if) (FRAG (ADJP (RB unintentionally) (JJ dull) (PP (IN in) (NP (NP (PRP$ its) (NN lack)) (PP (IN of) (NP (JJ poetic) (NNS frissons)))))))))
(ROOT (SBAR (IN ) (FRAG (ADJP (RB ) (JJ ) (PP (IN ) (NP (NP (PRP$ ) (NN )) (PP (IN ) (NP (JJ ) (NNS )))))))))