1) Causing death 2) Dead 3) Deadly 4) Deathlike 5) Exclusively Anglo word 6) Exclusively Saxon word 7) Fatal 8) In the manner of death 9) Pale descriptor 10) To a degree resembling death 11) Word with Anglo-Saxon origins 12) Word of purely Anglo origin Found on https://www.crosswordclues.com/clue/deathly
causing death; deadly; fatal. · like death: a deathly silence. · of, pertaining to, or indicating death; morbid: a deathly odor from the sepulcher. Found on https://www.infoplease.com/dictionary/deathly