The crossword solution for the term 'unlikely to show anger' is 'STOICAL'. Stoicism is a philosophical school of thought that originated in ancient Greece and was popularized by the Roman Empire. It emphasizes the importance of self-control and resilience in the face of adversity. Stoics believe that one should remain calm and composed in the face of difficult situations, and not give in to anger or other negative emotions. Therefore, the term 'STOICAL' is an appropriate description for someone who is unlikely to show anger.