1. A condition of damage or decay 
2. A misconception that is fallacious and not true or valid
   "the unsoundness of his conclusion was obvious" 
3. Not mentally or physically healthy
   "no one can be a poet without a certain unsoundness of mind"

Derived forms: unsoundnesses

See also: unsound

Type of: bad, badness, condition, misconception, status

Antonym: soundness

• tidal flow
• tidal river
• tidal stream
• tidal wave
• tidal zone
• tidally
• tidbit
• tiddler
• tiddley
• tiddly
• tiddlywinks
• tide
• tide over
• tide rip
• tide table
• tideland
• tideless
• tidemark
• tidewater
• Tidewater region
• tidewater river
• tidewater stream
• tideway
• tidily
• tidiness