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

The leadership election quickly turned into a coronation as an unassailable majority of the party’s 403 MPs backed Burnham. — Issy Ronald, CNN Money, 17 July 2026

Blatter looked unassailable right up to the moment he was toppled; his long-running heir apparent was also pushed out, which is how Infantino ended up as FIFA president in the first place. — David A. Graham, The Atlantic, 6 July 2026

Peru's right-wing presidential candidate Keiko Fujimori built what may be an unassailable lead on Tuesday as vote counting for the runoff election entered its final stages, official figures showed. — CBS News, 24 June 2026

There could then be a leadership contest, or a coronation, depending on whether other potential candidates think Burnham has an unassailable lead. — Kwiyeon Ha, Los Angeles Times, 19 June 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