Adjectives

(s)degagefree and relaxed in manner“rather degage after the nervousness he had shown at dinner” (Edmund Wilson)
(s)degage, detached, uninvolvedshowing lack of emotional involvement“adopted a degage pose on the arm of the easy chair” (J.S.Perelman), “she may be detached or even unfeeling but at least she's not hypocritically effusive”, “an uninvolved bystander”