Unconcerned

aloof blind blithe callous careless cold cool deaf detached dispassionate distant easy feckless forgetful hardened hard-hearted heedless impassive inattentive incurious indifferent insensible insensitive insouciant lackadaisical lukewarm negligent neutral nonchalant oblivious phlegmatic relaxed reserved self-centered serene stony supine unbothered uninterested uninvolved unmoved unperturbed unruffled unsympathetic untroubled unworried