WordReference Random House Learner's Dictionary of American English © 2019
ab•struse /æbˈstrus/USA pronunciation   adj. 
  1. hard to understand: abstruse theories of time and space.
ab•struse•ly, adv. 
ab•struse•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2019
ab•struse  (ab stro̅o̅s),USA pronunciation adj. 
  1. hard to understand;
    esoteric:abstruse theories.
  2. [Obs.]secret;
ab•strusely, adv. 
ab•struseness, n. 
  • Latin abstrūsus thrust away, concealed (past participle of abstrūdere), equivalent. to abs- abs- + trūd- thrust + -tus past participle suffix
  • 1590–1600
    • 1.See corresponding entry in Unabridged incomprehensible, unfathomable, arcane.
    • 1.See corresponding entry in Unabridged clear, uncomplicated, simple;

Collins Concise English Dictionary © HarperCollins Publishers::

abstruse /əbˈstruːs/ adj
  1. not easy to understand; recondite; esoteric
Etymology: 16th Century: from Latin abstrūsus thrust away, concealed, from abs- ab-1 + trūdere to thrust

abˈstrusely adv abˈstruseness n

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