Refers to the ancient Greek philosophical school founded by Zeno of Citium, emphasizing virtue, reason, and emotional self-control. Also used for the modern mindset inspired by it.
See also: ストイシズム
Stoicism teaches that one should follow reason without being swayed by emotions.
He maintained his Stoicism even in the face of hardship.
From ストア (Stoa, referring to the Stoa Poikile where Zeno taught) + 主義 (principle, -ism).