It means that if you are exposed to the material to which you are allergic, you may be severely injured or killed.
Errrrrr, Probs purple oleander
yes i am deathly allergic to them. i swell so big.
yes she is allergic to them and deathly afraid
yes i am allergic to tree nuts and i had a reaction to witch hazel
You can be allergic to both but being allergic to one does not mean you will be allergic to the other.
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No one is allergic to "spring". Spring allergies are usually associated with pollen from plants.
Deathly Spider? You mean a tarantula? It is only in the Summer and is at night.
Do you mean the Deathly Hallows?
I'm not so sure about what exactly IS her least favorite food but she is deathly allergic to Lobster if she eats it she will go into a coma.
your probably just allergic to the codeine in the Tylenol 3's
No. Death is a noun, also used as an adjunct (death throes, death bringer). The adverb "deathly" does not necessarily mean of or causing death, but can mean like death (deathly silence).