in·dif·fer·ent / inˈdif(ə)rənt/ • adj. 1. having no particular interest or sympathy; unconcerned: they all seemed indifferent rather than angry | most workers were indifferent to foreign affairs.2. neither good nor bad; mediocre: attempts to distinguish between good, bad, and indifferent work. ∎ not especially good; fairly bad: a pair of indifferent watercolors.3. neutral in respect of some specified physical property. ∎ archaic Biol. not specialized; undifferentiated.DERIVATIVES: in·dif·fer·ent·ly adv.