'Mighty' in the Bible

Many will tell me in that day, 'Lord, Lord, didn't we prophesy in your name, in your name cast out demons, and in your name do many mighty works?'

Then he began to denounce the cities in which most of his mighty works had been done, because they didn't repent.

"Woe to you, Chorazin! Woe to you, Bethsaida! For if the mighty works had been done in Tyre and Sidon which were done in you, they would have repented long ago in sackcloth and ashes.

You, Capernaum, who are exalted to heaven, you will go down to Hades. For if the mighty works had been done in Sodom which were done in you, it would have remained until this day.

Coming into his own country, he taught them in their synagogue, so that they were astonished, and said, "Where did this man get this wisdom, and these mighty works?

He didn't do many mighty works there because of their unbelief.