a.
1.
Neutral, impartial, disinterested, unbiassed.
2.
Unconcerned, unmoved, apathetic, cool, cold, inattentive, dead, heedless, regardless, unmindful, uninterested.
3.
Equal, all the same, just the same, all one, the same thing.
4.
Passable, tolerable, middling, ordinary, soso, mediocre, neither bad nor good, rather poor.