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Related Clues:
- Not transparent
- Tough to fathom
- Fraught with meaning
- Rife with meaning
- Dark and rich, as color
- Hardly transparent
- Benchley best-seller (with ''The'')
- Not clear
- Like the Mariana Trench
- Benchley novel "The __"
- Far beneath the surface
- Strongly felt
- Multilayered
- Profoundly philosophical
- Like ocean trenches