Indifferent

Definition:
1: marked by impartiality : unbiased
2a: that does not matter one way or the other
b: of no importance or value one way or the other
3a: marked by no special liking for or dislike of something
b: marked by a lack of interest, enthusiasm, or concern for something : APATHETIC


Synonyms:
INDIFFERENT, UNCONCERNED , INCURIOUS , ALOOF , DETACHED , DISINTERESTED mean not showing or feeling interest.
INDIFFERENT implies neutrality of attitude from lack of inclination, preference, or prejudice .
UNCONCERNED suggests a lack of sensitivity or regard for others' needs or troubles .
INCURIOUS implies an inability to take a normal interest due to dullness of mind or to self-centeredness .
ALOOF suggests a cool reserve arising from a sense of superiority or disdain for inferiors or from shyness .
DETACHED implies an objective attitude achieved through absence of prejudice or selfishness .
DISINTERESTED implies a circumstantial freedom from concern for personal or especially financial advantage that enables one to judge or advise without bias .



Reference: http://www.merriam-webster.com/dictionary/indifferent