Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class VI. Words Relating to the Sentient and Moral Powers
Section II. Personal Affections
3. Prospective Affections

866. Indifference.

   NOUN:INDIFFERENCE, neutrality; unconcern, insouciance, nonchalance; want of -interest, – earnestness; anorexia or anorexy, inappetence or inappetency; apathy (insensibility) [See Insensibility]; supineness (inactivity) [See Inactivity]; disdain [See Contempt]; recklessness [See Rashness]; inattention [See Inattention]; coldness &c. adj.; anaphrodisia.
  ANAPHRODISIAC or antaphrodisiac; lust-quencher, passion-queller.
   VERB:BE INDIFFERENT &c. adj.; stand neuter; take no interest in (insensibility) [See Insensibility]; have no desire for [See Desire], have no taste for, have no relish for; not care for; care nothing -for, – about; not care a -straw (unimportance) [See Unimportance] -about, – for; not mind.
  set at naught &c. (make light of) [See Underestimation]; spurn (disdain) [See Contempt].
   ADJECTIVE:INDIFFERENT, cold, frigid, luke-warm; cool, – as a cucumber; neutral, unconcerned, insouciant, phlegmatic, pococurantish, pococurante, easy-going, devil-may-care, careless, listless, lackadaisical; half-hearted, unambitious, unaspiring, undesirous, unsolicitous, unattracted, inappetent, all one to.
  UNATTRACTIVE, unalluring, undesired, undesirable, uncared for, unwished, unvalued.
  insipid [See Insipidity].
   ADVERB:for aught one cares; with utter indifference.
   INTERJECTION:NEVER MIND! who cares! it’s all one to me!    QUOTATIONS:
  1. Let the world slide, let the world go.
  2. A fig for care, and a fig for woe!—Heywood
  3. I care for nobody, no, not I, If no one cares for me.—Bickerstaff