'Bitterly' in the Bible

And Peter remembered the word of Jesus, which said unto him, Before the cock crow, thou shalt deny me thrice. And he went out, 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,

To all this the Pharisees listened, bitterly jeering at Him; for they were lovers of money.

And Peter went out, and wept bitterly.

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

I began to cry bitterly because no one was found worthy to open the scroll or look inside it.