Related Clues:

• Like the diving-board end
• "Star Trek: ___ Space Nine"
• Far from shallow
• Not superficial
• Like the diver's end of the pool
• Tough to grasp
• Difficult to understand
• Furrow-producing
• Clear as mud
• Low-pitched, as a voice
• Sea, with "the"
• How a quarterback may throw a ball
• Type of freezer or fryer
• Word with "fat" or "fry"
• Hard to understand, recondite