unquestionable

adjective

un·​ques·​tion·​able ˌən-ˈkwes-chə-nə-bəl 

-ˈkwesh-

: not questionable : indisputable

unquestionable evidence

unquestionable integrity

unquestionably

ˌən-ˈkwes-chə-nə-blē 

-ˈkwesh-

adverb

Synonyms of unquestionable

• undeniable
• indisputable
• indubitable
• irrefutable
• incontestable
• unarguable
• incontrovertible
• conclusive
• unchallengeable
• irrefragable
• unanswerable
• definite
• positive
• inarguable

Examples of unquestionable in a Sentence

a person of unquestionable integrity

His influence on modern art is unquestionable.

Recent Examples on the Web

Hearts have melted online after a scared rescue dog bravely faced her fear in order to join her owner, with many viewers praising her unquestionable courage and determination. —Alyce Collins, MSNBC Newsweek, 30 Mar. 2026

Growing tensions While his legacy is unquestionable, his departure from Liverpool is perhaps overdue and, like any relationship, there have been blips. —Ben Church, CNN Money, 25 Mar. 2026

In the eyes of hard-liners, Khamenei stood as the unquestionable authority — below only that of God. —Lee Keath, Fortune, 1 Mar. 2026

In the eyes of hard-liners, Khamenei stands as the unquestionable authority — below only that of God. —Dallas Morning News, 28 Feb. 2026

Word History

First Known Use

1587, in the meaning defined above

Rhymes for unquestionable

• questionable

Kids Definition

unquestionable

adjective

un·​ques·​tion·​able ˌən-ˈkwəs-chə-nə-bəl 

-ˈkwesh-

in rapid speech -ˈkwesh-nə-;

ˈən-

: not questionable : indisputable

unquestionable evidence

unquestionably

-blē 

adverb