aloof apathetic casual detached dispassionate effortless lackadaisical lukewarm mellow offhand unconcerned unemotional unflappable unperturbed unruffled airy blase calm careless cold collected composed cool disimpassioned disinterested easy happy impassive imperturbable incurious indifferent insouciant light listless loose neglectful negligent neutral placid serene smooth trifling uncaring unexcited unfeeling unimpressible untroubled