'Hard' in the Bible

Jesus looked around at them in anger, deeply hurt because of their hard hearts. Then he told the man, "Hold out your hand." The man held it out, and his hand was restored to health.

And He told His disciples to have a small boat stand ready for Him because of the many people, so that they would not crowd Him;

His disciples said to Him, “You see the crowd pressing in around You [from all sides], and You ask, ‘Who touched Me?’”

for they understood not concerning the loaves, for their heart hath been hard.

And Jesus, hearing it, said to them, Why are you reasoning among yourselves because you have no bread? do you still not see, and is it still not clear to you? are your hearts so hard?

Then again he put his hands on his eyes; and looking hard, he was able to see, and saw all things clearly.

But Jesus said to them, "He wrote this commandment for you because of your hard hearts.

Jesus looked around and said to His disciples, “How hard it is for those who have wealth to enter the kingdom of God!”

And the disciples were astonished at his words. But Jesus answereth again, and saith unto them, Children, how hard is it for them that trust in riches to enter into the kingdom of God!

And it will be hard for women who are with child and for her who has a baby at the breast in those days.

And later he was seen by the eleven themselves while they were taking food; and he said sharp words to them because they had no faith and their hearts were hard, and because they had no belief in those who had seen him after he had come back from the dead.