unassailable

[uhn-uh-sey-luh-buhl] / ˌʌn əˈseɪ lə bəl /

ADJECTIVE

certain

Synonyms

STRONGEST

absolute conclusive indisputable infallible irrefutable undeniable unequivocal

WEAK

ascertained authoritative clear confirmable definite demonstrable destined determined establishable evident firm fixed genuine guaranteed hard having down pat in the bag inarguable incontestable incontrovertible indubitable known on ice plain positive predestined provable real reliable safe salted away set sound supreme sure sure thing true trustworthy unambiguous undisputable undoubted unerring unmistakable unquestionable verifiable

Antonyms

STRONGEST

disputable doubtful dubious imperfect indefinite questionable refutable uncertain unsure vague

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.

Ultimately, the desire for a new jazz age is a wish for a new national identity as glamorous and unassailable as old Hollywood.

From Los Angeles Times • Jan. 28, 2026

Mr. Maduro’s prosecution is therefore legally unassailable not because it breaks new ground, but because it so closely follows a 36-year-old template the federal courts have already validated.

From The Wall Street Journal • Jan. 4, 2026

Australia have an unassailable 3-0 lead following victory in Adelaide, with matches in Melbourne and Sydney to come.

From BBC • Dec. 23, 2025

When England fly-half George Ford converted Sale's second try from Alex Wills after 46 minutes, the northwest side seemed to have an unassailable lead.

From Barron's • Nov. 28, 2025

But worst of all for Helene, the vultures build their nests above the clouds, atop the most unassailable peaks.

From "An Ember in the Ashes" by Sabaa Tahir

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