1. (adj) dangerous, grave, grievous, serious, severe, life-threatening
causing fear or anxiety by threatening great harm
Synonyms: severe, sober, serious, wicked, stark, unsafe, terrible, hard, spartan, stern, heavy, unplayful, weighty, monstrous, grave, good, grievous, atrocious, sedate, flagitious, life-threatening, dangerous, knockout, austere, heartbreaking, heartrending, solemn
Antonyms: unimportant, joyful, noncritical, good, noncrucial
2. (adj) grievous, heartbreaking, heartrending
causing or marked by grief or anguish
Synonyms: serious, life-threatening, atrocious, flagitious, severe, weighty, grave, heartbreaking, monstrous, heartrending, grievous, dangerous, heavy
Antonyms: unimportant, noncrucial, good, joyful, noncritical
3. (adj) grave, grievous, heavy, weighty
of great gravity or crucial import; requiring serious thought
Synonyms: heartrending, sullen, laborious, heavy, overweight, toilsome, intemperate, corpulent, sound, serious, gruelling, dense, grueling, wakeless, with child(p), threatening, solemn, grave, profound, backbreaking, severe, cloggy, heavy(a), large(p), great(p), clayey, enceinte, flagitious, grievous, monstrous, fleshy, atrocious, weighed down, hard, weighty, impenetrable, life-threatening, expectant, lumbering, ponderous, sedate, heartbreaking, sonorous, dangerous, arduous, operose, sober, rotund, heavy(p), big(a), labored, obese, laboured, punishing, cogent, telling, gravid, big(p), lowering, leaden
Antonyms: noncritical, unimportant, good, noncrucial, joyful
4. (adj) atrocious, flagitious, grievous, monstrous
shockingly brutal or cruel
Synonyms: frightful, serious, weighty, terrible, monstrous, heinous, flagitious, horrible, heavy, abominable, unspeakable, grotesque, awful, grave, grievous, atrocious, ugly, life-threatening, dreadful, horrifying, dangerous, heartbreaking, severe, painful, heartrending
Antonyms: good, joyful, noncrucial, noncritical, unimportant
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Synonyms and Antonyms of grievous 
