'Mighty' in the Bible

and sabbath having come, he began in the synagogue to teach, and many hearing were astonished, saying, 'Whence hath this one these things? and what the wisdom that was given to him, that also such mighty works through his hands are done?

and he was not able there any mighty work to do, except on a few infirm people having put hands he did heal them;

And the king Herod heard, (for his name became public,) and he said -- 'John the Baptist out of the dead was raised, and because of this the mighty powers are working in him.'

And Jesus said, 'Forbid him not, for there is no one who shall do a mighty work in my name, and shall be able readily to speak evil of me: