unassailable

adjective

un·​as·​sail·​able ˌən-ə-ˈsā-lə-bəl 

: not assailable : not liable to doubt, attack, or question

an unassailable argument

an unassailable alibi

unassailability

ˌən-ə-ˌsā-lə-ˈbi-lə-tē 

noun

unassailableness

ˌən-ə-ˈsā-lə-bəl-nəs 

noun

unassailably

ˌən-ə-ˈsā-lə-blē 

adverb

Synonyms of unassailable

• sacred
• holy

Examples of unassailable in a Sentence

one of the unassailable beliefs of that political party

Recent Examples on the Web

His victim, in her unassailable purity, resists him, thereby proving that the arrivistes populating the ranks of England’s most upwardly mobile class had a moral edge over the nobility. —Becca Rothfeld, New Yorker, 1 June 2026

Inside the firm, some are not quite so sure that this fraud detection capability is unassailable. —Lance Eliot, Forbes.com, 26 May 2026

That helps make its reach and capabilities unassailable, Nvidia management has argued. —Ian King, Fortune, 20 May 2026

Hansi Flick’s side require just one point to maintain an unassailable 11-point lead over second-place Madrid, with just three rounds of matches remaining. —Colin Millar, New York Times, 9 May 2026

Word History

First Known Use

1596, in the meaning defined above

Rhymes for unassailable

• available
• unsalable
• bailable
• mailable
• salable
• saleable
• scalable
• bioavailable
• unavailable

Kids Definition

unassailable

adjective

un·​as·​sail·​able ˌən-ə-ˈsā-lə-bəl 

: not assailable : not open to doubt, attack, or question

unassailably

-blē 

adverb