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Synonyms

undesirable

American  
[uhn-di-zahyuhr-uh-buhl] / ˌʌn dɪˈzaɪər ə bəl /

adjective

  1. not desirable or attractive; objectionable.

    undesirable qualities.


noun

  • undesirables
    plural
  1. a person or thing considered undesirable.

    a collection of malcontents and undesirables.

undesirable British  
/ ˌʌndɪˈzaɪərəbəl /

adjective

  1. not desirable or pleasant; objectionable

"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

noun

  1. a person or thing that is considered undesirable

"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

Derived Forms

Inflected Forms

Nouns

Etymology

Origin of undesirable

First recorded in 1660–70; un- 1 + desirable

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:

Recent concerns about AI agents going rogue and carrying out undesirable actions have lead to discussions among AI leaders about slowing down the pace of model development.

From MarketWatch ● Sep. 30, 2026

None of this means an undesirable outcome with AI is necessarily the result of human carelessness.

From The Wall Street Journal ● Sep. 15, 2026

One human rights concern raised in recent years is that AI can display biases against particular groups if trained on large datasets scraped from the internet which can include racist, sexist and other undesirable material.

From BBC ● Sep. 14, 2026

“But that’s how things have progressed, and the development of technology will always outpace the development of defenses against the undesirable effects of technology,” he said.

From Los Angeles Times ● Aug. 28, 2026

The entomologist, whose specialty is insects, is not so qualified by training, and is not psychologically disposed to look for undesirable side effects of his control program.

From "Silent Spring" by Rachel Carson

The skin barrier does more than just keeping undesirables out––it also is crucial for keeping certain essentials, like water, in.

From National Geographic ● Nov. 28, 2023

Mints are frequent offenders, and they top many gardeners’ lists of undesirables.

From Washington Post ● Mar. 29, 2023

Harboring and defending the undesirables and castoffs of the community irked her more “respectable” fellow parishioners.

From Slate ● Sep. 7, 2021

Police and local defense units carry out regular mass roundups of undesirables — including street hawkers, who practice a common form of survival across Africa.

From Los Angeles Times ● Sep. 24, 2015

The Immigration Act of 1917 barred thirty-three kinds of undesirables from entering the United States, and so, in 1922, on the deck of the Giulia, passengers distussed how to escape the categories.

From "Middlesex: A Novel" by Jeffrey Eugenides

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