The Hebrew verb adar conveys the idea of being great, glorious, or majestic. Used to describe the magnificence of God's actions and character — His might displayed in creation and salvation.
When Scripture uses adar of God, it points to the incomparable splendor of His redemptive acts. Exodus 15:11 marvels that none can compare to Yahweh in holiness and glorious deeds. The crossing of the Red Sea was a revelation of divine majesty. All of God's acts in history carry this quality: they are not only powerful but beautiful in their perfection.