unimpeachable

adjective

un·​im·​peach·​able ˌən-im-ˈpē-chə-bəl 

: not impeachable: such as

a

: reliable beyond a doubt

unimpeachable evidence

an unimpeachable source

b

: not liable to accusation : irreproachable

an unimpeachable reputation

unimpeachably

ˌən-im-ˈpē-chə-blē 

adverb

Examples of unimpeachable in a Sentence

a person of unimpeachable integrity

The information is from an unimpeachable source.

Recent Examples on the Web

Relative to some of the real heavy hitters in this competition, Mexico are not stacked with unimpeachable star power. — Jack Lang, New York Times, 1 July 2026

No doubt, dozens of them are doing extraordinary work, with genuinely heroic impact and unimpeachable integrity and efficacy. — Jeffrey Sonnenfeld, Time, 28 June 2026

Bream, in particular, finds Ross’s solo career unimpeachable. — Devon Ivie, Vulture, 14 May 2026

The Swiss houses, dominant precisely because their LBMA accreditation is unimpeachable, survive on fabrication margins, where a gold finding for a luxury jewelry house commands a premium over raw metal and a sovereign coin commands even more. — Lilian Raji, Forbes.com, 28 Apr. 2026

Word History

First Known Use

1784, in the meaning defined above

Rhymes for unimpeachable

• impeachable
• unreachable
• reachable
• teachable

Kids Definition

unimpeachable

adjective

un·​im·​peach·​able ˌən-im-ˈpē-chə-bəl 

: not impeachable : not to be doubted or questioned : irreproachable

an unimpeachable reputation

news from an unimpeachable source

unimpeachably

-blē 

adverb