profound

(a) showing intellectual penetration or emotional depth
- the differences are profound
- a profound insight
- a profound book
- a profound mind
- profound contempt
- profound regret
(s) of the greatest intensity; complete
- a profound silence
- a state of profound shock
(s) 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
fundamental,
(s) coming from deep within one
- a profound sigh
(s) (of sleep) deep and complete
- a heavy sleep
- fell into a profound sleep
- a sound sleeper
- deep wakeless sleep
wakeless, sound, heavy,
(s) 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
unfathomed, unplumbed, unsounded,

fundamental wakeless sound heavy unfathomed unplumbed unsounded

superficial

profoundly profoundly deaf profoundness