He's 'deadly' [='dead'] serious about finding another job.
Officers are allowed to use 'deadly force' if necessary.
The two gang leaders are 'deadly' enemies.
(..) the library the day she was attacked. Come on. ''Of the many fearsome beasts that roam our land. . . . . .none is more deadly than the basilisk. Capable of living for hundreds of years. . . . . .instant death awaits any who meet this giant serpent's eye. Spiders flee before it. '' Ron, this is it. (..)2002 Harry Potter and the Chamber of Secrets