a less-than-thrilling thriller . 
(ROOT (NP (DT a) (ADJP (ADJP (JJR less)) (HYPH -) (PP (IN than) (HYPH -) (ADJP (JJ thrilling)))) (NN thriller) (. .)))
(ROOT (NP (DT ) (ADJP (ADJP (JJR )) (HYPH ) (PP (IN ) (HYPH ) (ADJP (JJ )))) (NN ) (. )))