insouciant (in-SOO-see-uhnt) adjective
Happily unconcerned; carefree; nonchalant.
[From French insouciant, from in- (not) + souciant, present participle of soucier (to care), from Vulgar Latin sollicitare (to vex), from Latin sollicitus (anxious), from sollus (entire) + citus, past participle of ciere (to move).]
"[John] Brisker also voiced a strong loyalty to Seattle, the likes of which are rare among many of today's pro athletes who are insouciant about where they play."
-- Robert L. Jamieson Jr.; Former Sonic Forever Shrouded in Mystery; Seattle Post-Intelligencer; July 2, 2004.