Of, pertaining to, or characteristic of the Stoics; hence, manifesting or maintaining indifference to pleasure or pain; exhibiting or proceeding from calm fortitude: as, stoical indifference.

adjective. Enduring pain and hardship without showing feeling or complaint.

adjective. seeming unaffected by pleasure or pain; impassive

"After awhile he moved, lifted his head, and looked about him dully at first and then with a certain stoical acceptance of his plight."

stoical ethics  

unemotional  

apathetic  exemplary  fatalistic  immovable  impassible  

apathetic  calm  cool  disciplined  dispassionate