significantly less charming than listening to a four-year-old 
(ROOT (ADJP (ADJP (RB significantly) (RBR less) (JJ charming)) (PP (IN than) (S (VP (VBG listening) (PP (IN to) (NP (DT a) (ADJP (NP (CD four) (HYPH -) (NN year)) (HYPH -) (JJ old)))))))))
(ROOT (ADJP (ADJP (RB ) (RBR ) (JJ )) (PP (IN ) (S (VP (VBG ) (PP (IN ) (NP (DT ) (ADJP (NP (CD ) (HYPH ) (NN )) (HYPH ) (JJ )))))))))