ˈstōəˌsizəm noun
( -s )
1. usually capitalized : the principles or the philosophical system of the Stoics who based an austere ethics on a pantheistic cosmology holding that the world is governed by and is the embodiment of logos, that it is man's duty to conform freely to natural law and his destiny, that virtue is the highest good, and that the wise man should be free from passion equally unperturbed by joy or grief
2. : the principle or practice of showing indifference to pleasure or pain : repression of feeling : impassiveness
preparing himself with tranquil stoicism for the end — P.E.More