gaining most of its unsettling force 
(ROOT (S (VP (VBG gaining) (NP (NP (JJS most)) (PP (IN of) (NP (PRP$ its) (JJ unsettling) (NN force)))))))
(ROOT (S (VP (VBG ) (NP (NP (JJS )) (PP (IN ) (NP (PRP$ ) (JJ ) (NN )))))))