indifferent - adjective

• marked by a lack of interest
• showing no care or concern in attitude or action
• (usually followed by `to') unwilling or refusing to pay heed
• (often followed by `to') lacking importance; not mattering one way or the other
• fairly poor to not very good
• having only a limited ability to react chemically; chemically inactive
• marked by no especial liking or dislike or preference for one thing over another
• characterized by a lack of partiality
• being neither good nor bad
• neither too great nor too little

indifferent - thesaurus

apathetic   deaf   immaterial   inert   neutral   unbiased   unbiassed