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

Class VI. Words Relating to the Sentient and Moral Powers
Section I. Affections in General
Section IV. Possessive Relations

823. Insensibility.

   NOUN:INSENSIBILITY, insensibleness; want of sensibility [See Insensibility]; moral insensibility; inertness, inertia, vis inertiæ [L.]; impassibility, impassibleness; inappetency, apathy, phlegm, dullness, hebetude, supineness, insusceptibility, unimpressibility, luke-warmness.
  COLDNESS; cold -fit, – blood, – heart; coolness; frigidity, sang-froid [F.], stoicism, imperturbation (inexcitability) [See Inexcitability]; nonchalance, unconcern, dry eyes; insouciance (indifference) [See Indifference]; recklessness [See Rashness]; callousness, callosity, obtundity, brutification; heart of stone, blood and iron, stock and stone, marble, deadness.
  neutrality; quietism, vegetation.
  TORPOR, torpidity; obstupefaction [obs.], lethargy, coma, trance; sleep [See Inactivity]; inanimation [rare], suspended animation; stupor, stupefaction; paralysis, palsy; numbness &c. (physical insensibility) [See Physical Insensibility]; analgesia.
  stoic, Indian, man of iron, pococurante, pococurantist; the Fat Boy in Pickwick.
  TRIFLER, dabbler, dilettante, sciolist [See Ignoramus].
   VERB:BE INSENSIBLE &c. adj.; have a rhinoceros hide; show insensibility &c. n.; not mind, not care, not be affected by; have no desire for [See Indifference]; have -, feel -, take- no interest in; nil admirari [L.]; not care a straw (unimportance) [See Unimportance] for; disregard (neglect) [See Neglect]; set at naught &c. (make light of) [See Underestimation]; turn a deaf ear to (inattention) [See Inattention]; vegetate.
  RENDER INSENSIBLE, render callous; blunt, obtund, numb, benumb, paralyze, chloroform, deaden, hebetate, stun, stupefy; brutify, brutalize.
  INURE; harden, harden the heart; steel, caseharden, sear.
   ADJECTIVE:INSENSIBLE, unconscious; impassive, impassible; blind to, deaf to, dead to; obtundent, insusceptible or unsusceptible, unimpressionable, unimpressible; passionless, spiritless, heartless, soulless, unfeeling; unmoral.
  APATHETIC, unemotional, leucophlegmatic [obs.], phlegmatic; dull, frigid; cold cold-blooded, cold-hearted; cold as charity; flat, obtuse, inert, supine, sluggish, torpid, torpedinous [rare], torporific; sleepy (inactive) [See Inactivity]; languid, half-hearted, tame; numb, numbed; comatose; anæsthetic [See Physical Insensibility]; stupefied, chloroformed, palsy-stricken.
  INDIFFERENT, lukewarm, Laodicean, careless, mindless, regardless; inattentive [See Inattention]; neglectful [See Neglect]; disregarding.
  UNCONCERNED, nonchalant, pococurante, insouciant, sans souci [F.]; unambitious [See Indifference].
  UNAFFECTED, unruffled, unimpressed, uninspired, unexcited, unmoved, unstirred, untouched, unshocked, unstruck; unblushing (shameless) [See Insolence]; unanimated; vegetative.
  CALLOUS, thick-skinned, pachydermatous, impervious; hard, hardened; inured, casehardened; steeled -, proof- against; imperturbable (inexcitable) [See Inexcitability]; unfelt.
   ADVERB:INSENSIBLY &c. adj.; æquo animo [L.], without being -moved, – touched, – impressed; in cold blood; with dry eyes, with withers unwrung.
   INTERJECTION:never mind! it is of no consequence &c (unimportant) [See Importance]; it cannot be helped! it is all the same!    QUOTATIONS:
  1. But och! it hardens a’ within, And petrifies the feelin’.—Burns
  2. That repose Which stamps the caste of Vere de Vere.—Tennyson
  3. If he is content with a vegetable love.—Gilbert