Unbelievable

//ˌʌnbəˈliːvəbl̩// adj

adj ·Moderate ·High school level

Definitions

Adjective
  1. 1
    Not to be believed. literally

    "‘Come on, girls,’ said Steve, ‘be honest, we won.’ / ‘Yeah,’ said Raymond, ‘we let you off because you’re girls.’ / ‘You’re unbelievable,’ said Liz. / ‘Well, if we’re unbelievable,’ said Steve, ‘then you’re unbelievabler.’"

  2. 2
    Amazing, astonishing; so surprising that one is almost, or figuratively, unable to believe. figuratively

    "The most unbelievable thing happened to me today!"

  3. 3
    Implausible or improbable.

    "His excuse seems rather unbelievable."

Adjective
  1. 1
    beyond belief or understanding wordnet
  2. 2
    having a probability too low to inspire belief wordnet

Synonyms

All synonyms
implausibleincredibleincrediblewonderfula bit thicka bit thin

Example

More examples

"This story might sound unbelievable but it is true."

Etymology

From un- + believable.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.