Related Clues:

• Like an abyss
• See 113-Down
• Short and to the point
• __-sea
• ___ blue sea
• Worth thinking about
• Terse and meaningful
• Like the 10-foot end of the pool
• Right to the point
• Way down
• Profoundly
• Filled with import
• Seemingly bottomless
• Hardly superficial
• Cogent