deadliest
/ˈded.li/
副词
完全地；极其
I thought she was joking but she was deadly serious.
我原以为她在开玩笑，没想到她说的全是真的。
/ˈded.li/
形容词
致命的，致死的
a deadly virus
致命的病毒
完全的；极端的
They have been deadly enemies ever since Mark stole Greg's girlfriend.
自从马克抢走了格雷格的女朋友后，他们两人就成了死对头。
极其乏味的，非常无聊的
The party was deadly.
那个聚会非常乏味。