inconceivable

[in-kuhn-see-vuh-buhl] / ˌɪn kənˈsi və bəl /

ADJECTIVE

beyond reason, belief

Synonyms

STRONGEST

extraordinary implausible impossible improbable incredible mind-boggling strange unbelievable unheard-of unimaginable unthinkable

WEAK

fantastic incogitable incomprehensible insupposable phony rare reachy staggering thin unconvincing unknowable unlikely unsubstantial weak won't fly won't wash

Antonyms

STRONGEST

believable common credible familiar likely normal plausible possible reasonable tenable usual

WEAK

conceivable fathomable imaginable

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.

Positions they hold tomorrow may be inconceivable today.

From The Wall Street Journal • May 28, 2026

The pundits thought it was inconceivable when Donald Trump announced his run for the presidency in 2015.

From Los Angeles Times • May 18, 2026

"She will have seen just as much as Andrew. It's inconceivable that she didn't. She was so matey with Epstein."

From BBC • Mar. 20, 2026

Paramount has set a closing target date of Sept. 30, although the deal faces several regulatory hurdles, so it is not inconceivable that it will get pushed past that date.

From MarketWatch • Mar. 17, 2026

I can imagine Mother dying someday, but Daddy’s death seems inconceivable.

From "The Diary of a Young Girl" by Anne Frank

Vocabulary lists containing inconceivable

The Diary of Anne Frank

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!

Essential Academic Vocabulary for High School Students, List 2

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!

List 3

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!