'Mighty' in the Bible

And I saw a mighty angel who was exclaiming in a loud voice, "Who is worthy to open the book and break its seals?"

and with a mighty voice he cried out, saying, "Great Babylon has fallen, has fallen, and has become a home for demons and a stronghold for every kind of foul spirit and for every kind of foul and hateful bird.

while they stand afar off because of their terror at her heavy punishment, and say, 'Alas, alas, thou great city, O Babylon, the mighty city! For in one short hour thy doom has come!'

that you may feast on the flesh of kings and the flesh of generals and the flesh of mighty men, on the flesh of horses and their riders, and on the flesh of all mankind, whether they are free men or slaves, great men or small."