- not sound; unhealthy, diseased, or disordered, as the body or mind.
- decayed or impaired, as timber or foods; defective.
- 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.
Origin of unsound
SynonymsSee more synonyms on Thesaurus.com
Examples from the Web for unsound
That could easily prove an unsound assumption, but bear with me.Yes, We Scan: Why the NSA Collected Intelligence on Mexico and France
October 22, 2013
In 2005, a sort of freeze was ordered, leaving the residents in the unsound status quo.Why Firing Zone 918 is Relevant Today
June 25, 2013
Many of his theories are no doubt impracticable and unsound.The Works of Whittier, Volume VII (of VII)
John Greenleaf Whittier
But were not the Scribes and Pharisees in many things ignorant and unsound?Journal of a Residence at Bagdad
I see the jury returned a verdict of 'Suicide whilst of unsound mind!'The Green Rust
If they are unsound on one point only, there might yet be hope of their conversion.One Snowy Night
Emily Sarah Holt
They look upon her, who indulges it, as in an unsound condition.The Young Maiden
A. B. (Artemas Bowers) Muzzey
- diseased, weak, or unstableof unsound mind
- unreliable or fallaciousunsound advice
- lacking solidity, strength, or firmnessunsound foundations
- of doubtful financial or commercial viabilityan unsound enterprise
- (of fruit, timber, etc) not in an edible or usable condition
Word Origin and History for unsound
early 14c., of persons, "diseased, wounded," from un- (1) "not" + sound (adj.). Cf. Middle Low German unsund, Middle Dutch ongesont, German ungesund. Meaning "morally corrupt" is recorded from c.1300; that of "not mentally healthy" is from 1540s. Sense of "not based on reasoning or fact" is attested from 1590s.