sever = serious

来源于拉丁语的sever 意为 serious,earnest,to cut。

1.asseverate（使变得非常深刻和严肃 as<ad(=to,intensive) + sever(=serious)）
vt.断言
asseveration n.断言
The professor asseverated that more than half the students had cheated. 教授断言一半以上的学生都作弊了。

2.persevere（从头到尾始终非常严肃 per(through,throughout) + sever(=serious)）
vi. in + sth 坚持不解；（辩论中）固执已见
perseverance n.忍耐，坚持
persevering adj.有毅力的,锲而不舍的；固执的
It's important to persevere,especially when you feel like quitting. 坚持不解很重要，尤其是当你想放弃的时候。

3.severe
adj.严重的；剧烈的；严格的，苛刻的 *sever(=serious)

4.dissever
v.（使）分离；（使）分裂 *dis(=away),sever(=cut)

5.sever
v.切断，割断；中断；断绝；（使）分隔，（使）分离 *sever (=cut)

6.severance
n.割断，断绝；分离，隔离 *sever(=cut)
severance payment 解雇金，离职金
severance of diplomatic relations/of communications 断绝外交关系/通信中断