unsound

[uhn-sound]

adjective

unsounder, unsoundest 

1. not sound; unhealthy, diseased, or disordered, as the body or mind.

   Synonyms: unhealthy, ill, sick, infirm

2. decayed or impaired, as timber or foods; defective.

   Synonyms: unwholesome, rotten

3. not solid or firm, as foundations.

4. not well-founded or valid; fallacious.

   an unsound argument.

   Synonyms: faulty, erroneous, false

5. easily broken; light.

   unsound slumber.

6. not financially strong; unreliable.

   an unsound corporation.

unsound

/ ʌnˈsaʊnd /

adjective

1. diseased, weak, or unstable

   of unsound mind

2. unreliable or fallacious

   unsound advice

3. lacking solidity, strength, or firmness

   unsound foundations

4. of doubtful financial or commercial viability

   an unsound enterprise

5. (of fruit, timber, etc) not in an edible or usable condition

Other Word Forms

• unsoundly adverb
• unsoundness noun

Word History and Origins

Origin of unsound¹

Middle English word dating back to 1275–1325; un- ¹, sound ²

Example Sentences

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

The castle may have been demolished because it was structurally unsound or damaged in enemy attacks.

From BBC

“The problem with the President’s approach is that it is uncoordinated, uncalled for, and unsound,” he shared.

From Salon

He has said the city government has "grave concerns" about any deployment of troops, labelling the president's approach as "uncoordinated, uncalled for, and unsound".

From BBC

In a brief filed to the court, he called the firm's arguments "meritless and unsound."

From BBC

Related Words

• defective 
• erroneous 
• false 
• faulty 
• flawed 
• fragile 
• illogical 
• inaccurate 
• incorrect 
• insane 
• insecure 
• shaky 
• unbalanced 
• unhealthy 
• unreliable 
• unsafe 
• unstable