Unimpeachable
adjective /ˌʌnɪmˈpiːtʃəb(ə)l/ — Beyond any reasonable challenge or doubt.
Definition
Not able to be doubted, questioned, or criticized; so sound or established that no objection can be made.
Beyond the definition
Unimpeachable is the word for evidence so solid no lawyer can touch it, for a reputation so consistent no accusation can stick, for logic so airtight no counter-argument makes a dent. It's the highest form of credibility. The person or thing described has simply left no opening.
Origin & history
From un- 'not' + impeach, which comes from Old French empeechier 'to impede, hinder'. To impeach is to charge or call into question; unimpeachable means there is no charge that can be made to stick.
Example sentences
Illustrative sentences for learning, not verified community posts or sourced quotations.
The witness's unimpeachable credibility changed the course of the trial.
She built an unimpeachable case from thirty years of data.
His logic was unimpeachable — which was exactly what made the argument so uncomfortable.
How to use it
This entry uses an adjective. Follow the examples for the nouns it describes and its position in the sentence.
Choose “Unimpeachable” when the meaning fits your context: Not able to be doubted, questioned, or criticized; so sound or established that no objection can be made.
Synonyms
irreproachable, beyond reproach, unassailable, flawless, authoritative
Antonyms
questionable, dubious, unreliable, fallible
Related words
Word in the Wild
See how this word appears in life, language and stories.
Illustrative sentences and imagined stories for learning — not verified sightings, interviews, or sourced quotations.
Fictional scene
Gravity of Formal Truth
An adult in a silent, grand courtroom holds a single document, reflecting a profound commitment to legal process and gravity.
The vast, serious courtroom setting symbolizes a standard that is firmly established and beyond question. Holding the document represents an accountability so sound that no objection can be raised against its authority.
Image credit: Wordspun · AI-generated conceptual illustration
Questions about this word
What does "Unimpeachable" mean?
Unimpeachable is adjective meaning: Beyond any reasonable challenge or doubt.. Not able to be doubted, questioned, or criticized; so sound or established that no objection can be made.
Where does the word "Unimpeachable" come from?
From un- 'not' + impeach, which comes from Old French empeechier 'to impede, hinder'. To impeach is to charge or call into question; unimpeachable means there is no charge that can be made to stick.