Related Clues:

• Final resting place, for some
• Sharp or severe
• Quite sharp, as a pain
• Funereal
• Barge back
• Well-tuned
• Hardly frivolous
• Angle less than 90 degrees
• Stiffly formal
• Grave matter?
• No-nonsense
• Hardly luxurious
• Very serious
• Portending disaster
• Pyramid, really