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
If the chimney is structurally unsound, cracks also can leak carbon monoxide into the home.
—
Lauren Penington, The Denver Post, 24 Oct. 2024
Some healthcare venture darlings are actually get rich quick schemes with unsound fundamental economics.
—Sachin H. Jain, Forbes, 30 Dec. 2024
There may be unsound valuation practices at play or, worse, unsound accounting practices.
—Sachin H. Jain, Forbes, 30 Dec. 2024
The original bridge was rendered structurally unsound by the crash, and crews tore it down in three days to reopen I-95 through Norwalk.
—Joseph Wilkinson, New York Daily News, 2 Dec. 2024
See all Example Sentences for unsound 
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Lauren Penington, The Denver Post, 24 Oct. 2024
Some healthcare venture darlings are actually get rich quick schemes with unsound fundamental economics.
—Sachin H. Jain, Forbes, 30 Dec. 2024
There may be unsound valuation practices at play or, worse, unsound accounting practices.
—Sachin H. Jain, Forbes, 30 Dec. 2024
The original bridge was rendered structurally unsound by the crash, and crews tore it down in three days to reopen I-95 through Norwalk.
—Joseph Wilkinson, New York Daily News, 2 Dec. 2024
See all Example Sentences for unsound
Dictionary Entries Near unsound
Cite this Entry
“Unsound.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unsound. Accessed 27 Jan. 2025.
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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