Definition from Wiktionary, the free dictionary
See also indifférent
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- Not caring or concerned; uninterested, apathetic.
- He was indifferent to the proposal, since it didn't affect him, either way.
- Mediocre, usually used negatively in modern usage.
- The long distance and the indifferent roads made the journey impossible.
- The performance of Blue Jays has been indifferent during this season.
- Having no preference or bias, being impartial.
- I am indifferent between the two plans.
- Not significant in size or amount, immaterial.
- Even if one appliance consumes an indifferent amount of energy when left on stand-by overnight, together they can represent 10% of the electricity demand of a household.
- (mechanics) Being in the state of neutral equilibrium.
- a. 1600, William Shakespeare, The Taming of the Shrew, act 4, scene 1:
- Let their heads be sleekly combed their blue coats brushed and their garters of an indifferent knit
mediocre, usually used negatively
mechanics: being in neutral equilibrium
- (obsolete) To some extent, in some degree (intermediate between very and not at all); moderately, tolerably, fairly.
- The face of the Moon appearing to me to be full of indifferent high mountains...
Usage notes 
- Now obsolete, but very common c. 1600-1730.
- Oxford English Dictionary, Second Edition, 1989