Grievous
adjective
of great gravity or crucial import; requiring serious thought
“grave responsibilities”
Similar: grave, heavy, weighty
adjective
causing fear or anxiety by threatening great harm
“a dangerous operation”
Similar: dangerous, grave, serious, severe
adjective
causing or marked by grief or anguish
“a grievous loss”
Similar: heartbreaking, heartrending
adjective
shockingly brutal or cruel
“murder is an atrocious crime”
Similar: atrocious, flagitious, monstrous
Word family
grievously