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

• hallowed
• holy
• inviolable
• sacred
• sacrosanct
• untouchable

Examples of unassailable in a Sentence

one of the unassailable beliefs of that political party

Recent Examples on the Web

The public importance of these legal actions is unassailable. —Nick Akerman, New York Daily News, 9 May 2025

Intel, once seemingly unassailable, found its market challenged when Apple’s custom silicon revealed its relative stagnation. —Trefis Team, Forbes.com, 8 May 2025

Mathematical confirmation The 1-0 victory over Genoa on Sunday catapulted Como into 11th place, 17 unassailable points above the drop zone with 12 points left to play for. —David Ferrini, Forbes.com, 27 Apr. 2025

For four episodes, Good American Family is a tragic story of a woman fighting for her life against an unassailable evil, and nobody believes her. —Barry Levitt, Time, 9 Apr. 2025

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