1) Agonising 2) Agonizing 3) Excruciating 4) Extremely painful 5) Exclusively Saxon word 6) Exclusively Anglo word 7) Painful 8) Torturesome 9) Torturing 10) Torturous 11) Word with Anglo-Saxon origins 12) Word of purely Anglo origin Found on https://www.crosswordclues.com/clue/harrowing