grievous

Meanings

• causing fear or anxiety by threatening great harm
  • "grievous bodily harm"
• causing or marked by grief or anguish
  • "a grievous loss"
  • "a grievous cry"
• of great gravity or crucial import; requiring serious thought
  • "a grievous fault"
• shockingly brutal or cruel
  • "a grievous offense against morality"
  • "a grievous crime"

Synonyms

atrocious, dangerous, flagitious, grave, heartbreaking, heartrending, heavy, life-threatening, monstrous, serious, severe, weighty