From Longman Dictionary of Contemporary Englishfree spiritfree spiritINDEPENDENT PERSONsomeone who lives as they want to rather than in the way that society considers normal → free
Examples from the Corpus
free spirit• He could not remember having ever been in the company of such an exuberantly free spirit.• It was a celebration of freedom, free spirits and free enterprise.• October 20 A free spirit, captured in his own words Jeanson par Jeanson by Rene• One of your original free spirits, I guess.• There is no point booking a package holiday - this contains the essentially free spirit of the tack traveller.• Margaret radiated such radical free spirit, such electricity, that I fell directly in love.• These free spirits were on average ten to fifteen years my senior and old hands in high finance. 