Great and Mighty God is one of several descriptive names of God that speak of His might and power.
The Hebrew word gadol refers to greatness in size and importance and relates to magnify which is also used of God, a call to increase His status (Ps. 40:16). Gibbor indicates strength.
Great and Mighty God in Hebrew:
Ha’El haggadol haggibbor
Strong’s Concordance numbers: 410, 1419, 1368
Bible reference: Jer. 32:18
You show love to thousands but bring the punishment for the parents’ sins into the laps of their children after them. Great and mighty God, whose name is the Lord Almighty. (Jeremiah 32:18 NIV)
Similar names for God are the Mighty One of Israel, Mighty One, the great, the mighty, and the awesome God. He is also simply the Great God and Great King.