1 : (often followed by `to') lacking importance; not mattering one way or the other; "whether you choose to do it or not is a matter that is quite immaterial (or indifferent)"; "what others think is altogether indifferent to him"
2 : 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"
3 : showing little or no emotion or animation; "a woman who became active rather than apathetic as she grew older"
4 : lacking zest or vivacity; "he was listless and bored"
5 : characterized by a lack of partiality; "a properly indifferent jury"; "an unbiased account of her family problems"