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indifferent 
1 aloof, apathetic, callous, careless, cold, cool, detached, distant, heedless, impervious, inattentive, not give a monkey's  (slang) regardless, uncaring, unconcerned, unimpressed, uninterested, unmoved, unresponsive, unsympathetic 
2 immaterial, insignificant, of no consequence, unimportant 
3 average, fair, mediocre, middling, moderate, no great shakes  (informal) ordinary, passable, perfunctory, so-so  (informal) undistinguished, uninspired 
4 disinterested, dispassionate, equitable, impartial, neutral, nonaligned, nonpartisan, objective, unbiased, uninvolved, unprejudiced 
 
Antonyms  
 
1 avid, compassionate, concerned, eager, enthusiastic, interested, keen, responsive, sensitive, susceptible, sympathetic 
3 excellent, exceptional, fine, first-class, notable, remarkable