#1 indifferent s. [apathetic] marked by a lack of interest; "an apathetic audience"; "the universe is neither hostile nor friendly; it is simply indifferent". wn
#2 indifferent s. showing no care or concern in attitude or action; "indifferent to the sufferings of others"; "indifferent to her plea". wn
#3 indifferent s. [deaf] (usually followed by 'to') unwilling or refusing to pay heed; "deaf to her warnings". wn
#4 indifferent s. [immaterial] (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". wn
#5 indifferent s. fairly poor to not very good; "has an indifferent singing voice"; "has indifferent qualifications for the job". wn
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