Spartan

1. adjective

   unsparing and uncompromising in discipline or judgment; - H.G.Wells

   “a parent severe to the pitch of hostility”

   Similar: severe

2. adjective

   of or relating to or characteristic of Sparta or its people

3. adjective

   resolute in the face of pain or danger or adversity

   “spartan courage”

4. adjective

   practicing great self-denial; - William James

   “Be systematically ascetic...do...something for no other reason than that you would rather not do it”

   Similar: ascetic, ascetical, austere