'Bitterly' in the Bible

Then Peter remembered what Jesus had said: "Before the rooster crows, you will deny me three times." And he went outside and wept bitterly.

When he went out from there, the experts in the law and the Pharisees began to oppose him bitterly, and to ask him hostile questions about many things,

And he went outside and wept bitterly.

For I see that you are bitterly envious and in bondage to sin."

So I began weeping bitterly because no one was found who was worthy to open the scroll or to look into it.