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[uhn-uh-sey-luh-buh l]
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  1. not open to attack or assault, as by military force or argument: unassailable fortifications; unassailable logic.
  2. not subject to denial or dispute: Shakespeare's genius gives his works an unassailable position in world literature.

Origin of unassailable

1590–1600; un-1 + assailable
Related formsun·as·sail·a·bil·i·ty, un·as·sail·a·ble·ness, nounun·as·sail·a·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for unassailable

Contemporary Examples

Historical Examples

  • "You're just about as satisfying to talk to as a stump," she paid tribute to his unassailable calm.

    Good Indian

    B. M. Bower

  • That your communion was unassailable, would not prove that mine was indefensible.

    Apologia Pro Vita Sua

    John Henry Cardinal Newman

  • But,” said I, “you said that on the seaward side the place is unassailable.

    Sir Ludar

    Talbot Baines Reed

  • The open argument was unassailable, and she contented herself with that.


    Zona Gale

  • It is not necessary that your judgment should be unassailable.

British Dictionary definitions for unassailable


  1. not able to be attacked
  2. undeniable or irrefutable
Derived Formsunassailableness, noununassailably, adverb
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

Word Origin and History for unassailable


1590s, from un- (1) "not" + assailable (see assail). Related: Unassailably.

Online Etymology Dictionary, © 2010 Douglas Harper

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