Synonyms for Stoic (same or very similar meaning)
WordNet sense 1 (someone who is seemingly indifferent to emotions):
unemotional personWordNet sense 2 (seeming unaffected by pleasure or pain; impassive):
stoicalWordNet sense 3 (unsusceptible to or destitute of or showing no emotion):
unemotionalFrom the ODE community, based on WordNetadd/edit