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Synonyms

unintelligible

American  
[uhn-in-tel-i-juh-buhl] / ˌʌn ɪnˈtɛl ɪ dʒə bəl /

adjective

  1. not intelligible; not capable of being understood.

    Synonyms:
    undecipherable, baffling, incomprehensible

unintelligible British  
/ ˌʌnɪnˈtɛlɪdʒɪbəl /

adjective

  1. not able to be understood; incomprehensible

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of unintelligible

First recorded in 1610–20; un- 1 + intelligible

Explanation

Something unintelligible is difficult to understand, either because the room is too noisy or because the unintelligible thing is too quiet or confusing. We use our intelligence to understand things, and something intelligible is easy to understand. Therefore, unintelligible things are hard to understand. A coded message is unintelligible if you don't know the code. A whisper in a loud room is unintelligible. A weird sentence like "The waffles ran away from the Easter basket" is unintelligible because it doesn't make any sense. If you can't hear or understand something, it's unintelligible (and probably frustrating too).

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Vocabulary lists containing unintelligible

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.

I've heard more than once that my Spanish is unintelligible, the same criticism some people level at Bad Bunny's songs.

From BBC • Feb. 10, 2026

As last year’s wildfires multiplied, still 0% contained, field reporters — tasked with articulating the unintelligible on camera — grieved alongside Los Angeles in real time.

From Los Angeles Times • Jan. 5, 2026

Properly gauging product categories, individual relations, and cost calculations takes up a whopping amount of pages, complete with all kinds of jargon unintelligible to the lay consumer.

From Slate • Apr. 2, 2025

For example, during a rally in Montana on Friday, Trump appears to “glitch” and pause as he searches for words and then makes unintelligible noises and strange utterances.

From Salon • Aug. 13, 2024

As soon as the whole company was assembled, standing in a wide circle round Treebeard, a curious and unintelligible conversation began.

From "The Two Towers" by J. R. R. Tolkien

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