What is the meaning of profound?

adjective

• Showing intellectual penetration or emotional depth.
  • usage: "the differences are profound"; "a profound insight"; "a profound book"; "a profound mind"; "profound contempt"; "profound regret"
• Of the greatest intensity; complete.
  • usage: "a profound silence"; "a state of profound shock"
• Far-reaching and thoroughgoing in effect especially on the nature of something.
  • usage: "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"
  • synonyms: fundamental
• Coming from deep within one.
  • usage: "a profound sigh"
• Of sleep. ( deep and complete)
  • usage: "a heavy sleep"; "fell into a profound sleep"; "a sound sleeper"; "deep wakeless sleep"
  • synonyms: heavy, sound, wakeless
• Situated at or extending to great depth; too deep to have been sounded or plumbed.
  • usage: "the profound depths of the sea"; "the dark unfathomed caves of ocean-Thomas Gray; "unplumbed depths of the sea"; "remote and unsounded caverns"
  • synonyms: unfathomed, unplumbed, unsounded