1 : marked by no especial liking or dislike or preference for one thing over another; "indifferent about which book you would give them"; "was indifferent to their acceptance or rejection of her invitation"
2 : marked by a lack of interest; "an apathetic audience"; "the universe is neither hostile nor friendly; it is simply indifferent"
3 : (usually followed by `to') unwilling or refusing to pay heed; "deaf to her warnings"
4 : having only a limited ability to react chemically; chemically inactive; "inert matter"; "an indifferent chemical in a reaction"
