spartan in WordNet English dictionary

1. practicing great self-denial
   "Be systematically ascetic...do...something for no other reason than that you would rather not do it"- William James; "a desert nomad's austere life"; "a spartan diet"; "a spartan existence"
   ascetic  ascetical  austere  spartan 
   
2. unsparing and uncompromising in discipline or judgment
   "a parent severe to the pitch of hostility"- H.G.Wells; "a hefty six-footer with a rather severe mien"; "a strict disciplinarian"; "a Spartan upbringing"
   severe  spartan 
   
3. resolute in the face of pain or danger or adversity
   "spartan courage"
   spartan