'Dull' in the Bible

Now the eyes of Leah [were] dull, but Rachel was beautiful in form and appearance.

Look! The hand of Yahweh is not too short {to save}, and his ear is not [too] dull {to hear}.

For the heart of this people has become dull, and with their ears they hear with difficulty, and they have shut their eyes, so that they would not see with their eyes and hear with their ears and understand with their heart and turn, and I would heal them."

For the heart of this people has become dull, and with [their] ears they hear with difficulty, and they have shut their eyes, lest they see with [their] eyes, and hear with [their] ears, and understand with [their] heart, and turn, and I would heal them." '