Synonyms for deep

Some common synonyms of deep are: deep [a.] 1. Down-reaching, reaching far down, of great depth. 2. Mysterious, intricate, knotty, difficult, hard (to comprehend), unfathomable, profound. 3. Sagacious, penetrating, intelligent, discerning, shrewd, astute. 4. Absorbed, engrossed, rapt up. 5. Grave, low, not high, not sharp. 6. Dark, intense. 7. Great, thorough, entire, heartfelt.