(stō′ik) noun
A person apparently unaffected by pleasure or pain.
—adjective Indifferent to pleasure or pain; impassive; uncomplaining. Also sto′i·cal.
—sto′i·cal·ly adverb
—sto′i·cal·ness noun

(stō′ik) noun
A member of a school of Greek philosophy founded by Zeno about 308 B.C., holding the pantheistic beliefs that the world is a manifestation of a divine mind, that there is no reality but matter, even the human soul being doomed to dissolution, that wisdom lies in being superior to passion, joy, grief, etc., and in submission to the divine will.
—adjective Of or pertaining to the Stoics or Stoicism. [<L Stoicus <Gk. Stoikos <Stoa (Poikilē) (Painted) Porch, the colonnade at Athens where Zeno taught]