serious: [15] Serious comes ultimately from Latin sērius ‘serious, grave’. From this was derived late Latin sēriōsus, which passed into English via Old French serieux. It is not clear where sērius came from, although some have linked it with German schwer ‘heavy’ (‘seriousness’ and ‘weightiness’ being semantically close).
serious (adj.)
mid-15c., "expressing earnest purpose or thought" (of persons), from Middle French sérieux "grave, earnest" (14c.), from Late Latin seriosus, from Latin serius "weighty, important, grave," probably from a PIE root *swer- (4) "heavy" (cognates: Lithuanian sveriu "to weigh, lift," svarus "heavy;" Old English swære "heavy," German schwer "heavy," Gothic swers "honored, esteemed," literally "weighty"). As opposite of jesting, from 1712; as opposite of light (of music, theater, etc.), from 1762. Meaning "attended with danger" is from 1800.
实用例句
1. I know it's nothing serious and I feel quite unemotional about it.
我知道那根本没什么大不了的，所以有些无动于衷。
来自柯林斯例句
2. Smoking places you at serious risk of cardiovascular and respiratory disease.
吸烟会大大增加罹患心血管和呼吸道疾病的风险。
来自柯林斯例句
3. She was fitted with a pacemaker after suffering serious heart trouble.
她患上严重的心脏病后安装了心脏起搏器。
来自柯林斯例句
4. The allegations are serious enough to warrant an investigation.
这些指控很严重，有必要进行一番调查。
来自柯林斯例句
5. He sustained serious neck injuries after he broke someone's fall.