Profound Synonyms

Heartfelt, keen, very great, sincere, deep, deeply felt, acute, overwhelming, deep-rooted, ardent, radical, exhaustive, sweeping, intense, great, extreme, earnest, deepest, wholehearted, overpowering, deep-seated, fervent, far-reaching, extensive, thoroughgoing, and life-changing.

Wise, clever, with/showing great knowledge, intellectual, sage, erudite, penetrating, astute, full of insight, percipient, philosophical, sapient, learned, intelligent, knowledgeable, scholarly, sagacious, discerning, perceptive, thoughtful, insightful, perspicacious, and deep.

Complex, deep, serious, abstruse, esoteric, impenetrable, mysterious, dark, abstract, weighty, difficult, recondite, metaphysical, unfathomable, and obscure.