'Dull' in the Bible

then the priest shall examine them; and behold, if the bright spots on the skin of their body are a dull white, it is a harmless rash, it has broken out in the skin; he is clean.

for this people's heart has grown callous, their ears are dull of hearing, they have closed their eyes; or else perhaps they might perceive with their eyes, hear with their ears, understand with their heart, and should turn again; and I would heal them.'

For this people's heart has grown callous. Their ears are dull of hearing. Their eyes they have closed. Lest they should see with their eyes, hear with their ears, understand with their heart, and would turn again, and I would heal them.'

About him we have many words to say, and hard to interpret, seeing you have become dull of hearing.