The Collaborative International Dictionary of English v.0.48:

freewheeling \freewheeling\ adj.
   Acting heedless of consequences; acting without controls,
   external or internal; as, freewheeling foolishness.

   Syn: careless, irresponsible, reckless.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

freewheeling
    adj 1: free of restraints or rules; "freewheeling foolishness";
           "the versatility of his poetic freewheeling style"
    2: cheerfully irresponsible; "carefree with his money";
       "freewheeling urban youths"; "had a harum-scarum youth" [syn:
       carefree, devil-may-care, freewheeling, happy-go-
       lucky, harum-scarum, slaphappy]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "freewheeling":
   autarchic, autarkic, autonomous, free-spirited, independent,
   individualistic, inner-directed, neutral, nonaligned, nonpartisan,
   self-contained, self-dependent, self-determined, self-directing,
   self-governed, self-governing, self-reliant, self-subsistent,
   self-sufficient, self-supporting, sovereign, third-force,
   third-world