'Dull' in the Bible

For this people's mind is stupefied, their hearing has become dull, and their eyes they have closed; to prevent their ever seeing with their eyes, or hearing with their ears, or understanding with their minds, and turning back, so that I might heal them.'

For they had not learned the lesson taught by the loaves, but their minds were dull.

He perceived what they were saying, and He said to them, "What is this discussion of yours about having no bread? Do you not yet see and understand? Are your minds so dull of comprehension?

For this people's mind has grown callous, their hearing has become dull, and their eyes they have closed; to prevent their ever seeing with their eyes, or hearing with their ears, or understanding with their minds, and turning back, so that I might cure them.'

a schoolmaster for the dull and ignorant, a teacher of the young, because in the Law you possess an outline of real knowledge and an outline of the truth:

Nay, their minds were made dull; for to this very day during the reading of the book of the ancient Covenant, the same veil remains unlifted, because it is only in Christ that it is to be abolished.

Concerning Him we have much to say, and much that it would be difficult to make clear to you, since you have become so dull of apprehension.