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."