Indifferent

1. Not caring or concerned; uninterested, apathetic.
2. Indicating or reflecting a lack of concern or care.
3. Mediocre (usually used negatively in modern usage).
4. Having no preference or bias, being impartial.
5. Not making a difference; without significance or importance.
6. (mechanics) Being in the state of neutral equilibrium.
7. (obsolete) Not different, matching.