evanescent

from WordNet (r) 3.0 (2006)
evanescent
    adj 1: tending to vanish like vapor; "evanescent beauty"
    
from The Collaborative International Dictionary of English v.0.48
Evanescent \Ev`a*nes"cent\, a. [L. evanescens, -entis, p. pr. of
   evanescere.]
   1. Liable to vanish or pass away like vapor; vanishing;
      fleeting; as, evanescent joys.
      [1913 Webster]

            So evanescent are the fashions of the world in these
            particulars.                          --Hawthorne.
      [1913 Webster]

   2. Vanishing from notice; imperceptible.
      [1913 Webster]

            The difference between right and wrong, in some
            petty cases, is almost evanescent.    --Wollaston.
      [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
65 Moby Thesaurus words for "evanescent":
      atomic, brittle, capricious, changeable, corpuscular, corruptible,
      deciduous, disappearing, dissolving, dying, embryonic, ephemeral,
      evaporating, fading, fickle, fleeting, flitting, fly-by-night,
      flying, fragile, frail, fugacious, fugitive, germinal, granular,
      impalpable, imperceptible, impermanent, impetuous, imponderable,
      impulsive, inappreciable, inconstant, indiscernible, infinitesimal,
      insubstantial, intangible, invisible, melting, microcosmic,
      microscopic, molecular, momentary, mortal, mutable, nondurable,
      nonpermanent, passing, perishable, short-lived, subatomic,
      temporal, temporary, tenuous, thin, transient, transitive,
      transitory, ultramicroscopic, undurable, unenduring, unseeable,
      unstable, vanishing, volatile

    

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