with an unflappable air of decadent urbanity 
(ROOT (PP (IN with) (NP (NP (DT an) (JJ unflappable) (NN air)) (PP (IN of) (NP (JJ decadent) (NN urbanity))))))
(ROOT (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (JJ ) (NN ))))))