/ Dictionary / Index I imponderable: Meaning and Definition of Find definitions for: im•pon•der•a•ble Pronunciation: (im-pon'dur-u-bul), [key] — adj. not ponderable; that cannot be precisely determined, measured, or evaluated. —n. an imponderable thing, force, agency, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: imponderable (Thesaurus) imponderabilia impone Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language