(n.) The quality or state of being profound; depth of place, knowledge, feeling, etc.

Sophia abstruseness abyss acumen ampleness astuteness bigness bottomlessness broad-mindedness broadness capaciousness complexity complication comprehensiveness copiousness crabbedness crampedness deep-downness deep-rootedness deep-seatedness deepness depth difficulty discernment erudition esoterica expansiveness extensiveness extreme innerness fathomlessness generousness good understanding grandeur grandiosity grandness greatness hardness incomprehensibility indecipherability inscrutability interiority intricacy involvement keenness knottiness knowledgeability largeness mellow wisdom obscurity plumblessness profoundness reconditeness ripe wisdom sagacity sageness sapience scholarliness scholarship seasoned understanding sharpness sound understanding spaciousness subterraneity subtlety tallness wideness wisdom wiseness