Synonyms
- balmy
- barmy [chiefly British]
- bats
- batty
- bedlam
- bonkers
- brainsick
- bughouse [slang]
- certifiable
- crackbrained
- cracked
- crackers
- crackpot
- cranky [dialect]
- crazed
- crazy
- cuckoo
- daffy
- daft
- demented
- deranged
- fruity [slang]
- gaga
- haywire
- insane
- kooky
- kookie
- loco [slang]
- loony
- looney
- loony tunes
- looney tunes
- lunatic
- mad
- maniacal
- maniac
- mental
- meshuga
- meshugge
- meshugah
- meshuggah
- moonstruck
- non compos mentis
- nuts
- nutty
- psycho
- psychotic
- scatty [chiefly British]
- screwy
- unbalanced
- unhinged
- wacko
- whacko
- wacky
- whacky
- wud [chiefly Scottish]
Examples of unsound in a Sentence
The roof is structurally unsound.
disgruntled relatives tried to prove that the woman was of unsound mind when she made her will
Recent Examples on the Web
That’s unsound legal ground, argued Donald Tobin, a professor and former dean of the University of Maryland Francis King Carey School of Law.
—
Emily Opilo, Baltimore Sun, 18 July 2024
People in an area where a thunderstorm warning has been issued should remove themselves from unsound buildings and find substantial shelter, according to the NWS.
—James Powel, USA TODAY, 30 June 2024
The information that leaders use to make decisions can be unsound and guide them into costly errors.
—Tyler Jost, Foreign Affairs, 27 Apr. 2023
But financial professionals caution against following advice proliferating on the social media platform that might be unsound.
—Megan Cerullo, CBS News, 12 Apr. 2024
See all Example Sentences for unsound 
Emily Opilo, Baltimore Sun, 18 July 2024
People in an area where a thunderstorm warning has been issued should remove themselves from unsound buildings and find substantial shelter, according to the NWS.
—James Powel, USA TODAY, 30 June 2024
The information that leaders use to make decisions can be unsound and guide them into costly errors.
—Tyler Jost, Foreign Affairs, 27 Apr. 2023
But financial professionals caution against following advice proliferating on the social media platform that might be unsound.
—Megan Cerullo, CBS News, 12 Apr. 2024
See all Example Sentences for unsound
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'unsound.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near unsound
Cite this Entry
“Unsound.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unsound. Accessed 27 Jul. 2024.
Copy CitationKids Definition
unsound
adjective
un·sound
ˌən-ˈsau̇nd 
ˈən-
1
: not healthy or whole
an unsound horse
2
: not mentally normal : not wholly sane
of unsound mind
3
: not firmly made, placed, or fixed
an unsound structure
4
: not based on truth or logic
unsound arguments
unsoundness
noun
-ˈsau̇n(d)-nəs
Medical Definition
unsound
adjective
un·sound
-ˈsau̇nd
: not sound: as
a
: not healthy or whole
an unsound limb
an unsound horse
b
: not mentally normal : not wholly sane
of unsound mind
c
: not fit to be eaten
unsound food
unsoundness
noun
Legal Definition
unsound
adjective
un·sound
ˌən-ˈsau̇nd
: not sound: as
a
: not healthy or whole
b
: not mentally normal : not wholly sane
of unsound mind
c
: not firmly made, placed, or fixed
d
: not valid or true
an unsound argument
unsoundly
adverb
unsoundness
noun
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