Definition of "Profound" :
adjective: situated at or extending to great depth; too deep to have been sounded or plumbed
"The profound depths of the sea."
adjective: (of sleep) deep and complete
"Fell into a profound sleep."
adjective: coming from deep within one
"A profound sigh."
adjective: of the greatest intensity; complete
"A profound silence."
adjective: showing intellectual penetration or emotional depth
"The differences are profound."
adjective: far-reaching and thoroughgoing in effect especially on the nature of something
"Profound social changes."