Profound definition

(1) 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"

(2) (of sleep) deep and complete

"A heavy sleep"

"Fell into a profound sleep"

"A sound sleeper"

"Deep wakeless sleep"

(3) Coming from deep within one

"A profound sigh"

(4) Of the greatest intensity; complete

"A profound silence"

"A state of profound shock"

(5) Showing intellectual penetration or emotional depths; from the depths of your being

"The differences are profound"

"A profound insight"

"A profound book"

"A profound mind"

"Profound contempt"

"Profound regret"

(6) 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"