The term 'displaying no emotion' can be described by two words: STOIC and STONY. The word STOIC is derived from the ancient Greek philosophy of Stoicism, which emphasizes the importance of living a life of virtue and self-control. It is often used to describe someone who is emotionally detached and unresponsive to external stimuli. The word STONY is also used to describe someone who is emotionally distant and unresponsive. Both words are used to describe someone who is not displaying any emotion.