adjective

1. having or showing no partiality, bias, or preference; neutral
2. having or showing no interest, concern, or feeling; uninterested, apathetic, or unmoved
3. of no consequence or importance; immaterial
4. not particularly good or bad, large or small, right or wrong, etc.; fair, average, etc.
5. not really good; rather poor or bad
6. neutral in quality, as a chemical, magnet, etc.; inactive: chiefly in scientific use
7. capable of developing in various ways, as the cells of an embryo that are not yet specialized; undifferentiated

Etymology: OFr < L indifferens: see in- & different