profound (adj.)

c. 1300, "characterized by intellectual depth, very learned," from Old French profont, profund (12c., Modern French profond) and directly from Latin profundus "deep, bottomless, vast," also "obscure; profound; immoderate," from pro "forth" (from PIE root *per- (1) "forward") + fundus "bottom" (see fund (n.)).

The literal and figurative senses both were in Latin, but English, having already deep, has employed this word primarily in its figurative sense; however in 15c. it was used of deep lakes or wounds. Sense of "deeply felt, intense" is from c. 1400. Related: Profoundly. A verb profound "to penetrate, reach inside, saturate, fill" is attested in English from 15c.-17c.

Definitions of profound

profound (adj.)
showing intellectual penetration or emotional depth;
a profound mind
a profound book
profound regret
the differences are profound
a profound insight
profound contempt
profound (adj.)
of the greatest intensity; complete;
a profound silence
a state of profound shock
profound (adj.)
far-reaching and thoroughgoing in effect especially on the nature of something;
profound social changes
Synonyms: fundamental
profound (adj.)
coming from deep within one;
a profound sigh
profound (adj.)
(of sleep) deep and complete;
fell into a profound sleep
Synonyms: heavy / sound / wakeless
profound (adj.)
situated at or extending to great depth; too deep to have been sounded or plumbed; "the dark unfathomed caves of ocean"-Thomas Gray;
the profound depths of the sea
Synonyms: unfathomed / unplumbed / unsounded