'Sinful' in the Bible

Therefore some of the Pharisees said, “This man is not from God, for He doesn’t keep the Sabbath!” But others were saying, “How can a sinful man perform such signs?” And there was a division among them.

They called therefore a second time the man who had been blind, and said to him, Give glory to God: we know that this man is sinful.

He answered therefore, If he is sinful I know not. One thing I know, that, being blind before, now I see.