aimless for much of its running time 
(ROOT (S (ADJP (JJ aimless)) (PP (IN for) (NP (NP (JJ much)) (PP (IN of) (NP (PRP$ its) (VBG running) (NN time)))))))
(ROOT (S (ADJP (JJ )) (PP (IN ) (NP (NP (JJ )) (PP (IN ) (NP (PRP$ ) (VBG ) (NN )))))))