Are Stealth, Deadly and other keywords considered Character Abilities? Specifically, are characters with immunity to character abilities immune to Stealth, Deadly and others?

What happens when an immune character defends against a Deadly attack?

Also, does Milk of the Poppy erase Stealth, Deadly, etc or only text below that line?

Stealth, deadly, renown and the 5KE keywords aren´t considered to be charachter abilities. Although in the past they were considered to be charachter abilities, it was changed with the Valyria edition (or shortly after it´s release).

So a immune to charachter abilities charachter defending a deadly charachter will get snuffed. ;-)

Milk of the poppy erases the whole text box except for traits, so the keywords will be erased too.