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Definitions

unquestionable

[uhn-kwes-chuh-nuh-buhl] / ʌnˈkwɛs tʃə nə bəl /
ADJECTIVE
definite; beyond doubt
Synonyms
STRONGEST
absolute indisputable self-evident undeniable unequivocal unmistakable
WEAK
accurate authentic bona fide certain clear cold conclusive dependable down pat downright established faultless flat flawless for certain genuine incontestable incontrovertible indubitable irrefutable manifest no ifs ands or buts obvious pat patent perfect positive real reliable superior sure sure-enough true undisputable undoubted unimpeachable veritable well-founded well-grounded
Antonyms
STRONGEST
disputable indefinite uncertain unsure vague
WEAK
doubtful questionable

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“It’s unquestionable that climate change and environmental impacts are impacting the speed and severity of which things change. ... Climate resilience has to be part of the conversation.”

From Los Angeles Times • Jan. 27, 2026

The CMA said Google's market dominance was unquestionable.

From BBC • Oct. 10, 2025

No matter where people stand on Schulz’s point of view on comedy, his mark on pop culture with his punchlines has become unquestionable.

From Los Angeles Times • Mar. 4, 2025

For all England's unquestionable courage and energy, they have continually been undermined by mistakes this autumn.

From BBC • Nov. 16, 2024

Willard’s success was unquestionable, but for many years she shared the limelight with one of the most eccentric, unforgettable characters in the entire American experience.

From "1919 The Year That Changed America" by Martin W. Sandler