Terrible and terror describe what inspires dread because of a frightening appearance, greatness, power, cruelty, holiness, or judgment. The terms may describe human enemies and oppressive powers, but they are especially applied to God’s majesty, holiness, justice, covenant faithfulness, and fearful judgments.
God is called terrible because of his awful greatness, infinite power, inscrutable dealings, perfect holiness, covenant faithfulness, strict justice, and judgments. Enemies of God and his people may also be terrible. “The terror of the Lord” refers to reverent fear arising from the knowledge that Christ is Judge.