/ Dictionary / Index A abstruse: Meaning and Definition of Find definitions for: ab•struse Pronunciation: (ab-strs'), [key] — adj. hard to understand; recondite; esoteric: abstruse theories. secret; hidden. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: abstruse (Thesaurus) abstriction abstrusity Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language