Meaning

adjective shockingly repellent; inspiring horror

originFrom Middle English grisely, grysly, grissliȝ, griselich, grislich, from Old English grisliċ (“grisly, horrible; dreadful, horrid”), from grīsan (“to shudder with horror; to tremble, to be terrified; to make tremble, to terrify; to agrise, grise”) (unattested but implied in āgrīsan) + -lic (suffix forming adjectives meaning ‘characteristic of, pertaining to’). The word may also be an aphetic form…

Etymology from Wiktionary, CC BY-SA 3.0