severe
词根词缀：
asseverate v. 郑重声明
as 加强 + sever 诚恳 + ate 做 → 一再诚恳表示 → 郑重声明
severe adj. 严肃的；严厉的
sever 诚恳 + e → 态度诚恳 → 严肃的
severity n. 严肃；严厉
severe的名词形式
数据来源：新东方英语词汇速记大全
相关例句：
We are in one of the most severe recessions in modern times
我们正在经历现代最严重的一段经济衰退。
The country is beset by severe economic problems.
这个国家被严重的经济问题所困扰。
State police say that high tides and severe flooding have damaged beaches.
州警方称，高潮位和严重的水灾冲坏了海滩。
In a news release, the company said it had experienced severe financial problems.
在新闻稿中，该公司表示自己遭遇了严重的财务问题。
Steve passed out on the floor and woke up blinded and in severe pain
史蒂夫昏倒在地板上，醒来后什么也看不见了，还感到剧烈的疼痛。
Anaerobic respiration occurs only in particularly active tissues such as muscles during severe exercise.
厌氧呼吸只有在处于剧烈运动状态的肌肉等特别活跃的组织中才会发生。