nonchalant Synonyms

unperturbed offhanded undisturbed unceremonious unruffled uninterested unconcerned tepid stolid stoical serene relaxed pococurante pluckless placid phlegmatic perfunctory unaddicted laid-back unhurried unexcited unenthusiastic unemotional uncaring unflappable untroubled uninvolved imperturbable unworried slaphappy happy-go-lucky devil-may-care carefree halfhearted easygoing offhand nerveless discinct detached cool-headed cool composed complacent collected cavalier casual careless calm blithe blase