unsound

adjective
un·​sound | \ ˌən-ˈsau̇nd How to pronounce unsound (audio) \

Definition of unsound

: not sound: such as
a : not healthy or whole an unsound horse
b : not mentally normal : not wholly sane of unsound mind
c : not firmly made, placed, or fixed structurally unsound
d : not valid or true : invalid, specious unsound beliefs

Keep scrolling for more

Other Words from unsound

unsoundly \ ˌən-​ˈsau̇n(d)-​lē How to pronounce unsoundly (audio) \ adverb

Synonyms & Antonyms for unsound

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 (also kookie), loco [slang], loony (also looney), loony tunes (or looney tunes), lunatic, mad, maniacal (also maniac), mental, meshuga (or meshugge), moonstruck, non compos mentis, nuts, nutty, psycho, psychotic, scatty [chiefly British], screwy, unbalanced, unhinged, wacko (also whacko), wacky (also whacky), wud [chiefly Scottish]

Antonyms

balanced, compos mentis, sane, sound, uncrazy

Visit the Thesaurus for More 

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

Some could also be razed when structures are found to be unsound. Esther Fung, WSJ, "The Government May Want to Buy Your Dying Mall," 11 Sep. 2018 Lumber companies can sell some of the wood to recoup their expenses, but many of the trees are too decayed or structurally unsound to sell. Umair Irfan, Vox, "California has 129 million dead trees. That’s a huge wildfire risk.," 1 Sep. 2018 There's no hype for this adaptation of a schlocky 1997 novel about a scientifically unsound super-shark. Sam Machkovech, Ars Technica, "The Meg film review: We’re going to need a stupider boat," 10 Aug. 2018 Take it from one unsound sleeper: A little misting can go a long way. Brooke Bobb, Vogue, "5 Body Mists That Promise a Better Night’s Sleep—And Glowing Skin in the Morning," 29 July 2018 But the larger part for Democrats in Georgia is that their hope for revival is predicated on an unsound theory: That the level of Republican support among a shrinking percentage of white voters was relatively static. Chris Stirewalt, Fox News, "Georgia's disappointing Democrats," 22 May 2018 As a legal question, experts say Trump’s proposition is unsound. Salvador Rizzo, Washington Post, "President Trump’s misconceptions about immigration courts and law," 26 June 2018 The New York Department of Financial Services found that from 2007 to 2013, Deutsche Bank engaged in improper, unsafe, and unsound conduct in its currency trading business. BostonGlobe.com, "SHYFT Analytics to be acquird by New York company," 21 June 2018 The New York Times, the White House, America—are in fact built upon the softest of foundations: humans, messy and complicated and structurally unsound. Megan Garber, The Atlantic, "The Fourth Estate in the Age of Bad Faith," 15 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unsound.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of unsound

14th century, in the meaning defined above

Keep scrolling for more

Learn More about unsound

Dictionary Entries near unsound

unsorted

unsought

unsoul

unsound

unsoundable

unsounded

unsoundness

Statistics for unsound

Look-up Popularity

Time Traveler for unsound

The first known use of unsound was in the 14th century

See more words from the same century

Keep scrolling for more

More Definitions for unsound

unsound

adjective

English Language Learners Definition of unsound

: not based on truth or logic : not showing good judgment
: poorly built or in bad condition

unsound

adjective
un·​sound | \ ˌən-ˈsau̇nd How to pronounce unsound (audio) \

Kids Definition of unsound

1 : not based on good reasoning or truth an unsound argument unsound advice
2 : not firmly made or placed an unsound building
3 : not healthy or in good condition unsound teeth
4 : being or having a mind that is not normal

unsound

adjective
un·​sound | \ -ˈsau̇nd How to pronounce unsound (audio) \

Medical Definition of unsound

: 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

Other Words from unsound

unsoundness noun

Keep scrolling for more

unsound

adjective
un·​sound | \ ˌən-ˈsau̇nd How to pronounce unsound (audio) \

Legal Definition of unsound

: 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

Other Words from unsound

unsoundly adverb
unsoundness noun

Keep scrolling for more

More from Merriam-Webster on unsound

Rhyming Dictionary: Words that rhyme with unsound

Thesaurus: All synonyms and antonyms for unsound

Spanish Central: Translation of unsound

Nglish: Translation of unsound for Spanish Speakers

Britannica English: Translation of unsound for Arabic Speakers

Comments on unsound

What made you want to look up unsound? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

something valued as if it were money

Get Word of the Day daily email!

Test Your Vocabulary

Time Traveler Quiz: Which Word Came First?

  • time traveler quiz which word came first
  • Which came first?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!