bell pepper, sweet pepper / someone who is stupid, vapid, daft, not very bright (from the way that a bell pepper is mostly hollow inside, as a metaphor for such a person's head being empty)

robe

an appeal for something / emphasizing something in order to be a more compelling person to someone

make an appeal / to emphasize something in order to be a more compelling person to someone

(one's) deceased mother

mysterious

mystery

whether true or false

a female servant who cooks

presence or absence, life or death, existence or nonexistence