'Dull' in the Bible

“His eyes are dull from wine,And his teeth white from milk.

If the axe is dull and he does not sharpen its edge, then he must exert more strength. Wisdom has the advantage of giving success.

“Render the hearts of this people insensitive,Their ears dull,And their eyes dim,Otherwise they might see with their eyes,Hear with their ears,Understand with their hearts,And return and be healed.”

Behold, the Lord’s hand is not so shortThat it cannot save;Nor is His ear so dullThat it cannot hear.

For the heart of this people has become dull,With their ears they scarcely hear,And they have closed their eyes,Otherwise they would see with their eyes,Hear with their ears,And understand with their heart and return,And I would heal them.’

For the heart of this people has become dull,And with their ears they scarcely hear,And they have closed their eyes;Otherwise they might see with their eyes,And hear with their ears,And understand with their heart and return,And I would heal them.”’

Concerning him we have much to say, and it is hard to explain, since you have become dull of hearing.