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  • unknowable
    unknowable
    adjective
    not knowable; incapable of being known or understood.
  • Unknowable
    Unknowable
    noun
    philosophy the ultimate reality that underlies all phenomena but cannot be known
Synonyms

unknowable

American  
[uhn-noh-uh-buhl] / ʌnˈnoʊ ə bəl /

adjective

  1. not knowable; incapable of being known or understood.


noun

  1. something that is unknowable.

  2. the Unknowable, the postulated reality lying behind all phenomena but not cognizable by any of the processes by which the mind cognizes phenomenal objects.

unknowable 1 British  
/ ʌnˈnəʊəbəl /

adjective

  1. incapable of being known or understood

    1. beyond human understanding

    2. ( as noun )

      the unknowable

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Unknowable 2 British  
/ ʌnˈnəʊəbəl /

noun

  1. philosophy the ultimate reality that underlies all phenomena but cannot be known

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of unknowable

Middle English word dating back to 1325–75; see origin at un- 1, knowable

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.

He isn’t unknowable at all—and it’s crucial to understand what led up to his greater project on the Supreme Court.

From Slate • May 13, 2026

But, as Tate Britain’s concurrent “Turner and Constable” exhibition shows, Romantic nature was passionate and unstable, and all the more precious for being unknowable.

From The Wall Street Journal • Mar. 14, 2026

At its best, it’s poetry trying to make sense of the unknowable.

From Los Angeles Times • Mar. 13, 2026

The river, at times hauntingly beautiful and others murky and unknowable, offers a mirror to Daniel's torment, and to the increasingly fragile hope of his wife, Agnieszka, that Chris will one day come home.

From Barron's • Jan. 24, 2026

He understood in that moment that he was smaller than he had ever known, and the realm of the unknowable was bigger.

From "Strange the Dreamer" by Laini Taylor

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