ab·struse

[ab-stroos]
adjective
1.
hard to understand; recondite; esoteric: abstruse theories.
2.
Obsolete. secret; hidden.

Origin:
1590–1600; < Latin abstrūsus thrust away, concealed (past participle of abstrūdere), equivalent to abs- abs- + trūd- thrust + -tus past participle suffix

ab·struse·ly, adverb
ab·struse·ness, noun

abstruse, obtuse.


1. incomprehensible, unfathomable, arcane.


1. clear, uncomplicated, simple; obvious.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Abstruse is an SAT word you need to know.
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obtained or characterized by stealth
not able to be corrected
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World English Dictionary
abstruse (əbˈstruːs) [Click for IPA pronunciation guide]
 
adj
not easy to understand; recondite; esoteric
 
[C16: from Latin abstrūsus thrust away, concealed, from abs-ab-1 + trūdere to thrust]
 
ab'strusely
 
adv
 
ab'struseness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

abstruse
c.1600, from L. abstrusus, pp. of abstrudere "conceal," lit. "to thrust away," from ab- "away" + trudere "to thrust, push" (see extrusion).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Unfortunately, it is sometimes difficult for the economic operators to
  comprehend the abstruse provisions correctly.
Though abstruse, these definitions could shape the long-term future of genetic
  testing.
If your initial topic seems abstruse, consider the motivation that led you to
  it in the first place.
He often took other people's briefs, many times on abstruse issues, and made
  them snappy and compelling.
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