"deathly" in the adjective sense
1. deathlike, deathly
having the physical appearance of death
"a deathly pallor"
2. deadly, deathly, mortal
causing or capable of causing death
"a fatal accident"
"a deadly enemy"
"mortal combat"
"a mortal illness"
"deathly" in the adverb sense
1. deathly
to a degree resembling death
"he was deathly pale"
2. extremely, exceedingly, super, deathly
to an extreme degree
"extremely cold"
"extremely unpleasant"
"she is super smart"
"the night was deathly cold"
"as a child, I was deathly afraid of snakes"
Source: WordNet® (An amazing lexical database of English)
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