profound

When you need a word that's deeper than "deep," consider profound.

Profundus meant literally "deep" in Latin, and profound had the same meaning when it entered English in the 14th century. But even then, it also meant "figuratively deep" — that is, very great or intense: "The new laws have had a profound impact." Of people, it means "very knowledgeable or insightful," but sometimes if a person tries to sound profound they're really just giving you superficial knowledge dressed up with big words.

Definitions of profound
1

adj situated at or extending to great depth; too deep to have been sounded or plumbed

“the profound depths of the sea”
Synonyms:
unfathomed, unplumbed, unsounded
deep
having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination

adj coming from deep within one

“a profound sigh”
Synonyms:
deep
relatively deep or strong; affecting one deeply

adj showing intellectual penetration or emotional depth

“the differences are profound
“a profound insight”
“a profound book”
“a profound mind”
profound contempt”
profound regret”
Synonyms:
intense
possessing or displaying a distinctive feature to a heightened degree
deep
marked by depth of thinking
thoughtful
having intellectual depth
scholarly
characteristic of scholars or scholarship
Antonyms:
superficial
concerned with or comprehending only what is apparent or obvious; not deep or penetrating emotionally or intellectually
careless
marked by lack of attention or consideration or forethought or thoroughness; not careful
outward
relating to physical reality rather than with thoughts or the mind
apparent, ostensible, seeming
appearing as such but not necessarily so
dilettante, dilettanteish, dilettantish, sciolistic
showing frivolous or superficial interest; amateurish
facile
arrived at without due care or effort; lacking depth
glib
marked by lack of intellectual depth
looking, sounding
appearing to be as specified; usually used as combining forms
shallow
lacking depth of intellect or knowledge; concerned only with what is obvious
skin-deep
penetrating no deeper than the skin: "her beauty is only skin-deep"
frivolous
not serious in content or attitude or behavior
show more antonyms...

adj of the greatest intensity; complete

“a profound silence”
“a state of profound shock”
Synonyms:
intense
possessing or displaying a distinctive feature to a heightened degree

adj (of sleep) deep and complete

“fell into a profound sleep”
Synonyms:
heavy, sound, wakeless
deep
relatively deep or strong; affecting one deeply

adj far-reaching and thoroughgoing in effect especially on the nature of something

profound social changes”
Synonyms:
fundamental
important, significant
important in effect or meaning