The definition of grievous is something very serious, grave or severe.
(adjective)A serious mistake that could cost someone his life is an example of a mistake that would be described as grievous.
See grievous in Webster's New World College Dictionary
adjective
Origin: ME grevous < OFr < grever: see grieve
Related Forms:
See grievous in American Heritage Dictionary 4
adjective
Origin:
Origin: Anglo-Norman grevous
Origin: , from grever, to harm, aggrieve
Origin: , from Latin gravāre, to burden; see grieve
.Related Forms:
Learn more about grievous