indifferent

Synonyms: aloof apathetic blase callous cold cool detached diffident disinterested dispassionate distant equitable haughty heartless heedless highbrow impartial impervious inattentive listless neutral nonchalant nonpartisan objective passionless phlegmatic regardless scornful silent stoical supercilious superior unaroused unbiased uncaring uncommunicative unconcerned unemotional unimpressed uninvolved unmoved unprejudiced unresponsive unsocial unsympathetic

Antonyms: caring compassionate concerned feeling interested involved sympathetic