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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.

See Examples For:

The measures are directed at addressing operational gaps identified in the episode, including an unintelligible transmission to air-traffic controllers, who failed to notify a nearby passenger jet of the president’s helicopter.

From The Wall Street Journal ● Aug. 12, 2026

It’s a strange occurrence, but no stranger than her suddenly speaking an unintelligible language during the morning broadcast, just before collapsing.

From Salon ● Jun. 13, 2026

The fan shouts “Aaron Burr! Aaron Burr!” but his mouth is so stuck full of peanut butter that he’s unintelligible.

From Los Angeles Times ● Feb. 14, 2026

Like Bad Bunny, I have also heard people say that my Puerto Rican Spanish is unintelligible.

From BBC ● Feb. 10, 2026

Forms leaned together in the taxis as they waited, and voices sang, and there was laughter from unheard jokes, and lighted cigarettes outlined unintelligible gestures inside.

From " The Great Gatsby" by F. Scott Fitzgerald

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