grievous (adj.)

c. 1300, from Anglo-French grevous (Old French grevos) "heavy, large, weighty; hard, difficult, toilsome," from grief (see grief). Legal term grievous bodily harm attested from 1803.

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Definitions of grievous from WordNet

grievous (adj.)
causing fear or anxiety by threatening great harm;
grievous bodily harm
Synonyms: dangerous / grave / serious / severe / life-threatening
grievous (adj.)
causing or marked by grief or anguish;
a grievous loss
a grievous cry
Synonyms: heartbreaking / heartrending
grievous (adj.)
of great gravity or crucial import; requiring serious thought;
a grievous fault
Synonyms: grave / heavy / weighty
grievous (adj.)
shockingly brutal or cruel;
a grievous offense against morality
a grievous crime