UNSOUND Synonyms: 298 Similar and Opposite Words

unsound

adjective

ˌən-ˈsau̇nd

Definition of unsound

as in sick

temporarily suffering from a disorder of the body an unsound horse that will have to be disqualified from the race

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Antonyms & Near Antonyms

as in unreasonable

not using or following good reasoning it is clearly unsound to argue that just because a scientific explanation for that phenomenon does not currently exist, no such explanation is possible

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Antonyms & Near Antonyms

as in insane

unable to think in a clear or sensible way disgruntled relatives tried to prove that the woman was of unsound mind when she made her will

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Antonyms & Near Antonyms

as in erroneous

not being in agreement with what is true an unsound and pernicious stereotype

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Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of unsound Denials based on unwritten or misapplied rules or standards, or perhaps on subjective personal preferences, would be on unsound standing. — Nicole R. Kurtz, Miami Herald, 7 May 2026 What becomes alarmingly evident through the key assumptions check is how many of the current responses expect a quick resolution of the conflict — a supposition that is unsound, or at least unsupported. — Judd Devermont, semafor.com, 27 Apr. 2026 The logic behind Liam Rosenior’s shift to a back five at Brighton & Hove Albion on Tuesday was not entirely unsound. — Conor O'Neill, New York Times, 22 Apr. 2026 This not only makes the shade problem worse, Chamberlain says, but makes the tree more structurally unsound and vulnerable to damage in harsh weather conditions. — Peg Aloi, The Spruce, 30 Mar. 2026 See All Example Sentences for unsound

Recent Examples of Synonyms for unsound

Adjective

Hospital executives have begun reporting more unpaid medical bills, and experts warn health plans will raise premiums further as they're left with enrollees who are, on average, sicker and more expensive to cover.

— Christine Mai-Duc, NPR, 23 Aug. 2026
When workers become sick, exhausted, or unable to work safely, productivity falls, disruptions increase, and supply chains become more vulnerable.

— Lucy Siers, Footwear News, 21 Aug. 2026

Definition of sick

Adjective

For example, antiquarian scholars introduced the erroneous notion that druids built stone circles—most notably Stonehenge—for their ceremonies, an idea that became embedded in the popular imagination during the 18th century.

— Encyclopedia Britannica, Encyclopedia Britannica, 14 Aug. 2026
The erroneous reports prompted Katsina United to release another statement confirming Ozor’s death.

— Adam England, PEOPLE, 14 Aug. 2026

Definition of erroneous

Adjective

For however poorly things are going — and the bad tone set by the starters has leaked into some defensive lapses and some pressing at the plate — the Padres got themselves into a really favorable position before this.

— Kevin Acee, San Diego Union-Tribune, 4 Sep. 2025
This involves having a poorly or non-functioning colon and is not usually reversible.

— Dr. John De Jong, Boston Herald, 17 Aug. 2025

Definition of poorly

Adjective

But the question remained unsolved for polygons with irrational angles.

— Sam Macdonald, Scientific American, 14 Aug. 2026
As a result, the argument goes, today's spending is irrational because the hardware would need to be replaced too frequently to generate an attractive return on investment, known as ROI.

— , CNBC, 12 Aug. 2026

Definition of irrational

Adjective

Psychiatric disorders are generally divided into mood disorders and psychotic disorders, Osborne said; postpartum psychosis is a mood disorder, in which mood symptoms accompany psychotic symptoms.

— Jen Christensen, CNN Money, 13 Aug. 2026
But to make some generalization that all career women are psychotic because Glenn Close happened to be psychotic at the end of that movie is just silly.

— Mark Olsen, Los Angeles Times, 12 Aug. 2026

Definition of psychotic

Adjective

During more than 2,600 test interactions, researchers found inaccurate answers, weak sources, and serious safety failures.

— Dan Fitzpatrick, Forbes.com, 23 Aug. 2026
That is inaccurate, not what the investigation covers, and viral posts on X are misleading people either through incompetence or purposefully misleading information.

— Ian Miller OutKick, FOXNews.com, 21 Aug. 2026

Definition of inaccurate

Browse Nearby Words

unsought

unsound

unsoundness

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“Unsound.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unsound. Accessed 27 Aug. 2026.

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Synonyms of unsound

adjective

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