Related Clues:

• Stern
• Grave
• Earnest
• Somber
• Important
• On the level
• Solemn
• Weighty
• Not kidding
• 'I'm not kidding'
• Not fooling
• Not to be taken lightly
• Not light or frivolous
• So to rise in confusion round us must not be taken lightly
• Rise round us from the grave