8 letters · 12 points in Scrabble
adjective causing fear or anxiety by threatening great harm
adjective causing or marked by grief or anguish
adjective of great gravity or crucial import; requiring serious thought
originFrom Middle English grevous, from Anglo-Norman grevous, from Old French grever, from Latin gravō (“to burden”). Developed in the 13th century. Equivalent to grief + -ous.
Etymology from Wiktionary, CC BY-SA 3.0