profound

Adjective

• situated at or extending to great depth; too deep to have been sounded or plumbed
  • the profound depths of the sea
    
  • the dark unfathomed caves of ocean-Thomas Gray
    
  • unplumbed depths of the sea
    
  • remote and unsounded caverns
    

• (of sleep) deep and complete
  • a heavy sleep
    
  • fell into a profound sleep
    
  • a sound sleeper
    
  • deep wakeless sleep
    

• coming from deep within one
  • a profound sigh
    

• far-reaching and thoroughgoing in effect especially on the nature of something
  • the fundamental revolution in human values that has occurred
    
  • the book underwent fundamental changes
    
  • committed the fundamental error of confusing spending with extravagance
    
  • profound social changes
    

• of the greatest intensity; complete
  • a profound silence
    
  • a state of profound shock
    

• showing intellectual penetration or emotional depth
  • the differences are profound
    
  • a profound insight
    
  • a profound book
    
  • a profound mind
    
  • profound contempt
    
  • profound regret
    

Related words

• Synonyms: 
  unfathomed , unplumbed , unsounded , heavy , sound , wakeless , fundamental