unsound
Americanadjective
-
not sound; unhealthy, diseased, or disordered, as the body or mind.
-
decayed or impaired, as timber or foods; defective.
- Synonyms:
- unwholesome, rotten
-
not solid or firm, as foundations.
-
not well-founded or valid; fallacious.
an unsound argument.
-
easily broken; light.
unsound slumber.
-
not financially strong; unreliable.
an unsound corporation.
adjective
-
diseased, weak, or unstable
of unsound mind
-
unreliable or fallacious
unsound advice
-
lacking solidity, strength, or firmness
unsound foundations
-
of doubtful financial or commercial viability
an unsound enterprise
-
(of fruit, timber, etc) not in an edible or usable condition
Other Word Forms
Etymology
Origin of unsound
Middle English word dating back to 1275–1325; see origin at un- 1, sound 2
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:
EagleBank also approved the client for a federally guaranteed loan even after a top lending officer ruled it was unsound.
From The Wall Street Journal ● Jul. 19, 2026
Germany is uniquely neurotic about debt and about unsound money.
From BBC ● Mar. 27, 2026
I joke to Shires that, as a man, most often the unsound advice I have received is to simply go look for a rebound.
From Los Angeles Times ● Sep. 29, 2025
The judge pointed out that there was no evidence to support that theory, and he faulted the prosecutors for legally unsound charges, like alleging assault while making claims about actions merely being negligent.
From Slate ● May 9, 2024
It worked in their second game, when the little man overreached himself with an unsound assault.
From "A Dance with Dragons" by George R. R. Martin
At once the unsoundest and the most attractive argument is to be found in the deliberate idealization of particular ages, the thirteenth century in England, for example, or the age of the Antonines.
From New Worlds For Old A Plain Account of Modern Socialism by H. G. (Herbert George) Wells
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
