Meaning

noun a member of the ancient Greek school of philosophy founded by Zeno

noun someone who is seemingly indifferent to emotions

adjective seeming unaffected by pleasure or pain; impassive

originFrom Latin stōicus (noun via Middle English Stoycis pl), from Ancient Greek Στωϊκός (Stōïkós), from Ποικίλη Στοά (Poikílē Stoá, “the Stoa Poikile”, literally “painted portico”), the portico in Athens where Zeno of Citium was teaching.

Etymology from Wiktionary, CC BY-SA 3.0