Synonyms and related words :
Bohemian, affable, casual, cordial, degage, easy, easygoing, familiar, free and easy, gracious, haymish, homely, homey, informal, irregular, loose, natural, offhand, offhanded, plain, relaxed, simple, sociable, unaffected, unassuming, unceremonious, unconstrained, unconventional, unofficial, unstudied