stoicness UK /ˈstəʊɪknəs/US /ˈstoʊɪknəs/ noun2 •The quality or state of being stoic; impassiveness, endurance, or indifference to pleasure or pain.1780, July 10, London...habitual stoicness enable me to bear, without ever extorting from me the least lamentation. — 1891 •The nature or characteristics of the school of philosophy centered on reason and endurance; used in analytical discourse.The Stoicness of Seneca's tragedies is not, according to R., a simple thing. — 1991