a mildly funny , sometimes tedious , ultimately insignificant 
(ROOT (NP (NP (DT a) (ADJP (ADJP (RB mildly) (JJ funny)) (, ,) (ADJP (RB sometimes) (JJ tedious)))) (, ,) (ADJP (RB ultimately) (JJ insignificant))))
(ROOT (NP (NP (DT ) (ADJP (ADJP (RB ) (JJ )) (, ) (ADJP (RB ) (JJ )))) (, ) (ADJP (RB ) (JJ ))))