impassiveness

from WordNet (r) 3.0 (2006)

impassiveness
    n 1: apathy demonstrated by an absence of emotional reactions
         [syn: {emotionlessness}, {impassivity}, {impassiveness},
         {phlegm}, {indifference}, {stolidity}, {unemotionality}]

from The Collaborative International Dictionary of English v.0.48

Impassive \Im*pas"sive\, a.
   Not susceptible of pain or suffering; apathetic; impassible;
   unmoved.
   [1913 Webster]

         Impassive as the marble in the quarry.   --De Quincey.
   [1913 Webster]

         On the impassive ice the lightings play. --Pope.
   -- {Im*pas"sive*ly}, adv. -- {Im*pas"sive*ness}, n.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

impassiveness \im*pas"sive*ness\ n.
   an absence of emotion.

   Syn: apathy, impassivity.
        [WordNet 1.5]

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