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[im-pon-der-uh-buh l] /ɪmˈpɒn dər ə bəl/
not ponderable; that cannot be precisely determined, measured, or evaluated.
an imponderable thing, force, agency, etc.
Origin of imponderable
From the Medieval Latin word imponderābilis, dating back to 1785-95. See im-2, ponderable
Related forms
imponderability, imponderableness, noun
imponderably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for imponderable
Historical Examples
  • A hot body was one which had absorbed an imponderable substance.

    The Machinery of the Universe Amos Emerson Dolbear
  • Matter was for the moment as subtle, as imponderable as soul.

    The Tyranny of the Dark Hamlin Garland
  • We have not the slightest reason to believe that Aether is imponderable.

    Aether and Gravitation

    William George Hooper
  • At all events the onus of proof rests with those who assert it is imponderable.

    Aether and Gravitation

    William George Hooper
  • Likeness, dear Baron, is often the result of imponderable things.

    Three Plays Luigi Pirandello
  • The presence of imponderable fluids could not here be pleaded.

    Louis Pasteur Ren Vallery-Radot
  • It is imponderable—can we conceive of matter without weight?

  • The air did not affect him; he was not only light, but imponderable.

    Urania Camille Flammarion
  • Manifestly he came to her to get rid of the imponderable burden of the present.

    The Border Legion Zane Grey
  • What I might have gained is, in the scale, like imponderable air.

British Dictionary definitions for imponderable


/ɪmˈpɒndərəbəl; -drəbəl/
unable to be weighed or assessed
something difficult or impossible to assess
Derived Forms
imponderability, imponderableness, noun
imponderably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for imponderable

1794, "weightless," from assimilated form of in- (1) "not, opposite of" + ponderable (see ponder). Figurative use, "unthinkable," from 1814. Related: Imponderably. As a noun, by 1842.

Online Etymology Dictionary, © 2010 Douglas Harper
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