profound

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”

of the greatest intensity; complete

• “a profound silence”
• “a state of profound shock”

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”

coming from deep within one

• “a profound sigh”

(of sleep) deep and complete

• “a heavy sleep”
• “fell into a profound sleep”
• “a sound sleeper”
• “deep wakeless sleep”

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”