The Collaborative International Dictionary of English v.0.48:
freewheeler \freewheeler\ n. Someone acting freely or even irresponsibly. Syn: free agent, free spirit. [WordNet 1.5]WordNet (r) 3.0 (2006):
freewheeler n 1: someone acting freely or even irresponsibly [syn: free agent, free spirit, freewheeler]