/ Dictionary / Index I inscrutable: Meaning and Definition of Find definitions for: in•scru•ta•ble Pronunciation: (in-skr'tu-bul), [key] — adj. incapable of being investigated, analyzed, or scrutinized; impenetrable. not easily understood; mysterious; unfathomable: an inscrutable smile. incapable of being seen through physically; physically impenetrable: the inscrutable depths of the ocean. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: inscrutable (Thesaurus) inscroll insculp 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