Word: spartan
Austere, frugal, characterized by self-denial. Example: I went on the retreat to the monastery, thinking I would be sleeping in a spartan cell, only to discover a simple but comfortable bedroom.
Resolute in the face of danger or adversity. Example: The spartan legionaries vowed to fight to the death.
Lacking in decoration and luxury. Example: After ten years as a fashion designer in the rough-and-tumble Garment District, Eloise left New York for the spartan but serene life of a farmer's wife.
You can find a list of possible crossword clues for SPARTAN below.