stoicism
US /ˈstoʊ.ɪ.sɪ.zəm/
UK /ˈstoʊ.ɪ.sɪ.zəm/

1.
the endurance of pain or hardship without the display of feelings and without complaint
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Her stoicism in the face of adversity was admirable.
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He faced the painful treatment with remarkable stoicism.
2.
an ancient Greek school of philosophy founded at Athens by Zeno of Citium
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The principles of Stoicism emphasize virtue, reason, and harmony with nature.
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Many modern self-help philosophies draw inspiration from Stoicism.