Roget's Thesaurus: Entry 866 (Indifference)

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#866. Indifference. -- N. indifference, neutrality; coldness &c. adj.; anaphrodisia[obs]; unconcern, insouciance, nonchalance; want of interest, want of earnestness; anorexy[obs], anorexia, inappetency[obs]; apathy &c. (insensibility) 823; supineness &c. (inactivity) 683; disdain &c. 930; recklessness &c. 863; inattention &c. 458.

anaphrodisiac[obs], antaphrodisiac[obs]; lust-quencher, passion- queller[obs].

V. be indifferent &c. adj.; stand neuter; take no interest in &c. (insensibility) 823; have no desire for &c. 865,have no taste for, have no relish for; not care for; care nothing for, care nothing about; not care a straw about, not care a fig for, not care a whit about &c. (unimportance) 643; not mind.

set at naught &c. (make light of) 483; spurn &c. (disdain) 930.

Adj. indifferent, cold, frigid, lukewarm; cool, cool as a cucumber; unconcerned, insouciant, phlegmatic, pococurante[obs], easygoing, devil- may-care, careless, listless, lackadaisical; half-hearted; unambitious, unaspiring, undesirous[obs], unsolicitous[obs], unattracted.

[indifferent toward people] aloof, unapproachable, remote; uncaring.

unattractive, unalluring, undesired, undesirable, uncared for, unwished[obs], unvalued, all one to.

insipid &c. 391; vain.

Adv. for aught one cares.

Int. never mind; Who cares? whatever you like, whatever.

Phr. I couldn't care less, I could care less; anything will do; es macht nichts [German].