adjective showing intellectual penetration or emotional depth
Oppositessuperficial
adjective of the greatest intensity; complete
Similarintense
adjective far-reaching and thoroughgoing in effect especially on the nature of something
Synonymsfundamental
Similarsignificant
adjective coming from deep within one
Similardeep
adjective situated at or extending to great depth; too deep to have been sounded or plumbed
Similardeep
Source: WordNet 3.1, Princeton University