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

For now, though, Morgan Rogers and Cole Palmer look unassailable in those positions. — Jack Lang, New York Times, 11 Sep. 2026

Beat a potential competitor in September, and a December debate may already have an unassailable answer. — Eddie Brown, San Diego Union-Tribune, 3 Sep. 2026

It's got a great business, unassailable business, not a monopoly, but close to it. — Alexa Lomonaco, CNBC, 31 Aug. 2026

All of which is beating around the bush on the way to say that the set was pretty unassailable for an abridgement of what is about to come on tour. — Chris Willman, Variety, 30 Aug. 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