Indifferent

adjective

Imperfectly sensible to distinctions among things.

    "You tiresome man!" cried Indolentio's wife,
    "You've grown indifferent to all in life."
    "Indifferent?" he drawled with a slow smile;
    "I would be, dear, but it is not worth while."

        Apuleius M. Gokul


—Ambrose Bierce, The Devil's Dictionary