ETYM Latin stoicus, Greek: cf. French stoďque. Related to Stoic.
Seeming unaffected by pleasure or pain; impassive; SYN. stoical.

Pertaining to Stoicism or its followers.

ETYM Latin stoicus, Greek from stoikos a roofed colonnade, a porch, especially, a porch in Athens where Zeno and his successors taught.
Someone who is seemingly indifferent to emotions; SYN. unemotional person.

A member of the ancient Greek school of philosophy founded by Zeno