Synonyms for Freewheeling (same or very similar meaning)
WordNet sense 1 (not subject to restraint):
unrestrainedWordNet sense 2 (cheerfully irresponsible):
carefree, devil-may-care, happy-go-lucky, harum-scarum, slaphappyWordNet sense 3 (showing lack of care for consequences):
irresponsibleFrom the ODE community, based on WordNetadd/edit