Which term describes a person who remains unaffected by emotional experiences such as joy or grief?

The term that describes a person who remains unaffected by emotional experiences such as joy or grief is "stoic." Stoicism is an ancient philosophy that teaches the development of self-control and fortitude as a means of overcoming destructive emotions. A stoic individual practices self-discipline and often aims to maintain a calm and rational state of mind regardless of external circumstances or emotional disturbances.

This mindset allows them to endure hardship without complaint or show of emotional distress, embodying the essence of being emotionally resilient and unaffected by the ups and downs of life. The concept emphasizes maintaining an objective perspective and focusing on what can be controlled rather than being swayed by feelings.

Other options like sycophant, suppliant, and subterfuge do not pertain to the same emotional detachment. A sycophant is someone who acts obsequiously toward someone important in order to gain advantage, a suppliant is a person making a humble plea to someone in power, and subterfuge refers to deceit used to achieve one's goals. These terms do not encapsulate the notion of emotional indifference or resilience that stoic represents.