Related Clues:
- Low in pitch
- Difficult to fathom
- Up to one's eyeballs
- Like a basso's voice
- Oceanic
- Like a basso profundo
- Word before freeze or fry
- Not at all superficial
- Tough to fathom
- Fraught with meaning
- Rife with meaning
- Dark and rich, as color
- Benchley best-seller (with ''The'')
- Submarine zone
- Like the Mariana Trench