Related Clues:

• Reserve
• Good form
• Politesse
• Propriety
• Humbleness
• What blowhards lack
• Unwillingness to crow
• Blowhard's lack
• Braggart's lack
• Victorian virtue
• Etiquette
• "Aw shucks" quality
• Trait of a good sportsman
• Asset of one who's retiring
• Dignity