Synonyms of grievous in English:

grievous


See definition of grievous

adjective

1‘the victim suffered grievous injuries in the accident’

SYNONYMS
serious, severe, grave, bad, critical, dreadful, terrible, awful
painful, agonizing, hurtful, afflicting, wounding, damaging, injurious
sharp, acute
peracute
ANTONYMS

slight, trivial

2‘that is most grievous news’

SYNONYMS
disastrous, calamitous
crushing, distressing, traumatic, harrowing
sorrowful, mournful, sad
ANTONYMS

good

3‘a grievous sin’

SYNONYMS
heinous, grave, deplorable, shocking, appalling, atrocious, gross, dire, outrageous, dreadful, egregious, iniquitous, nefarious, shameful, lamentable
flagrant, glaring
rare flagitious
ANTONYMS

trivial, venial