grievous
/ˈgriːvəs/adjective
- formal (of something bad) very severe or serious〈正式〉（坏事, 灾祸）极其严重的, 剧烈的：
his death was a grievous blow
他的死是一次沉重的打击
the American fleet suffered grievous losses.
美国舰队损失惨重。
USAGE
Grievous ends with -ous and has two syllables: it should not be pronounced as if it ended with -ious and had an extra syllable.
派生词
grievously
adverbgrievousness
noun词源
Middle English: from Old French greveus, from grever （see GRIEVE1）.