Related Clues:

• Graduation, e.g.
• Having a stiff upper lip
• Not overly emotional
• Not moved much
• Not reacting to pain, say
• Hard to stir
• Epictetus, for one
• Marcus Aurelius was one
• Matrimony, for one
• Ceremonial
• Unemotional sort
• Traditional ceremony
• It's a tradition
• Student of Zeno
• Ceremony, liturgy