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

Australia have retained the Ashes at the earliest opportunity by taking an unassailable 3-0 lead over England with victory in the third Test in Adelaide.

From BBC • Dec. 20, 2025

The truth was, the legal system had its own unassailable logic, a logic that couldn’t be shifted.

From "The 57 Bus" by Dashka Slater

Vocabulary lists containing unassailable

Julius Caesar

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!

A Doll's House

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

100 SAT Words Beginning with "U"

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!