Wiktionary
unrelaxing
a. Not relaxing.
Usage examples of "unrelaxing".
Some heat would be carried around by atmospheric circulation from the sunward side, but not enough, it would seem, to keep water from being perpetually frozen, or the ground from being baked with unrelaxing frost.
On our side we obeyed another law of political economy: We clung to our property with unrelaxing tenacity, made the best use of it in our intercourse with our fellows, and only gave it up after our release and entry into a land where the plenitude of cooking utensils of superior construction made ours valueless.