abstruse
Americanadjective
-
hard to understand; recondite; esoteric.
abstruse theories.
- Synonyms:
- arcane, unfathomable, incomprehensible
- Antonyms:
- obvious, simple, uncomplicated, clear
-
Obsolete. secret; hidden.
adjective
Other Word Forms
Etymology
Origin of abstruse
1590–1600; < Latin abstrūsus thrust away, concealed (past participle of abstrūdere ), equivalent to abs- abs- + trūd- thrust + -tus past participle suffix
Explanation
Abstruse things are difficult to comprehend because they are deep, complex, and intellectually challenging. While a riddle may be a little tricky to figure out, theoretical quantum entanglement is abstruse. The Latin root of the word abstruse is abstrusus, meaning "hidden, concealed, secret," which is a good way to remember the meaning of this word. It describes something so dense or complex that its meaning feels hidden from understanding. A theory or a text is abstruse when it requires deep study to uncover its "hidden" truth. Some famously abstruse topics include high-level mathematics like Category Theory, "the mathematics of mathematics," and certain coding languages, like Malbolge.
Vocabulary lists containing abstruse
300 Most Difficult "SAT" Words
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Frankenstein
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Mr. Barnes has long brought something exotic to English literature, but never anything so abstruse as to become alienating.
From The Wall Street Journal • Jan. 16, 2026
Also, his estimate arose from abstruse economic formulas and lots of magic asterisks.
From Los Angeles Times • Jul. 8, 2025
That might sound like an abstruse philosophical argument, but he says it's a hot debate within the scientific community.
From Salon • Jun. 15, 2025
The particle is part of a concept called the Higgs mechanism that was added to the standard model in the 1970s to explain an abstruse but important puzzle.
From Science Magazine • Mar. 27, 2024
At sixteen, he made his way through Bertrand Russell and Alfred North Whitehead’s famously abstruse masterpiece Principia Mathematica.
From "Outliers" by Malcolm Gladwell
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
