unimpeachable

American  

[uhn-im-pee-chuh-buhl] / ˌʌn ɪmˈpi tʃə bəl /

adjective

1. above suspicion; impossible to discredit; impeccable.

   unimpeachable motives.

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unimpeachable British  

/ ˌʌnɪmˈpiːtʃəbəl /

adjective

1. unquestionable as to honesty, truth, etc

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Other Word Forms

• unimpeachability
  noun
• unimpeachableness
  noun
• unimpeachably
  adverb

Etymology

Origin of unimpeachable

First recorded in 1775–85; un- ¹ + impeachable

Explanation

Unimpeachable describes someone or something that is totally, completely, without any doubt, innocent and good, like an unimpeachable role model who avoids bad influences and sketchy situations. Impeach means "to accuse, or charge with a crime." It is a verb usually reserved for when high-ranking officials like presidents do something wrong. So, when you add the prefix un- and the suffix -able, the result is an adjective that means "not able to be accused," in other words, beyond doubt or question. If you run for public office and your past is unimpeachable, your opponents will have nothing to use against you in their advertisements.

Example Sentences

Unimpeachable in his motives, Mireles epitomises the story Heineman thought he was telling when he first arrived: “At first, it seemed to be a tale of good fighting evil.”

From The Guardian • Aug. 30, 2015

Unimpeachable logic and in layman's language -- but still a rather complicated chain of cause and effect.

From Time Magazine Archive

Unimpeachable in sentiment, but too obviously inspired for us to view them with satisfaction. 

From The Vagabond in Literature by Rickett, Arthur

Unimpeachable in her private life, and, however misguided, with deeply-seated religious principles, she has yet left a name held in more general execration than any other on the roll of English sovereigns.

From History of the Reign of Philip the Second, King of Spain, Vols. 1 and 2 by Prescott, William Hickling

Unimpeachable bravery, unwavering perseverance, cool fortitude, and determined steadiness of purpose, were amongst the most conspicuous of his attributes; and to these we may add an inexhaustible energy of mind.

From Memoirs of the Extraordinary Military Career of John Shipp Late a Lieut. in His Majesty's 87th Regiment by Shipp, John