Severe is an adjective that can mean:
1. (of something bad or undesirable) very great; intense
2. strict or harsh in the treatment of others
3. very plain in style or appearance
4. (of weather conditions) extremely bad or unpleasant
5. (of a medical condition) very serious or dangerous
哎呦喂，severe这个词儿可有意思了，咱们来好好掰扯掰扯：
1. 形容特别严重、特别厉害的事儿，比如"severe pain"就是疼得要命那种
2. 说人特别严厉、不近人情，像"severe teacher"就是那种特别凶的老师
3. 形容东西特别朴素、没啥装饰，比如说"severe style"就是极简风
4. 形容天气特别恶劣，像"severe weather"就是那种狂风暴雨的鬼天气
5. 说病情特别严重，比如"severe illness"就是病得不轻那种
补充说明：这个词儿在口语里用得可多了，比如"Don't be so severe!"就是"别这么较真儿！"的意思。咱们中国人说"严丝合缝"、"铁面无私"这些词儿，跟这个severe都有点儿像。