Synonyms for profound

modified

1. Physically deep

   fathomless, bottomless, subterranean; see deep 1.

2. Intellectually deep

   learned, recondite, heavy, erudite, scholarly, abstruse, mysterious, sage, serious, sagacious, penetrating, discerning, knowing, wise, reflective, knowledgeable, intellectual, enlightened, thorough, informed, of great learning, immensely learned; see also intelligent 1, learned 2, solemn 1.

   Antonyms superficial*, shallow, flighty.

3. Emotionally deep

   heartfelt, deep-felt, great; see intense.