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 host made five changes after taking an unassailable 2-0 lead in the three-match series. — ABC News, 30 Sep. 2026

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

George is so deeply rooted in the traditions of country music, so beloved and respected and unassailable in his song choices. — Ilana Kaplan, PEOPLE, 8 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

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