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.
Entries linking to grievous
grief n.
early 13c., "hardship, suffering, pain, bodily affliction," from Old French grief "wrong, grievance, injustice, misfortune, calamity" (13c.), from grever "afflict, burden, oppress," from Latin gravare "make heavy; cause grief," from gravis "weighty" (from PIE root *gwere- (1) "heavy"). Meaning "mental pain, sorrow" is from c. 1300. Good grief as an exclamation of surprise, dismay, etc., is from 1912.