A Calvinist defines God. From Wayne Grudem’s Systematic Theology:

1. There is but one only, living, and true God, who is infinite in being and
perfection, a most pure spirit, invisible, without body, parts, or passions; immutable,
immense, eternal, incomprehensible, almighty, most wise, most holy, most free, most
absolute; working all things according to the counsel of his own immutable and most
righteous will, for his own glory; most loving, gracious, merciful, long-suffering,
abundant in goodness and truth, forgiving iniquity, transgression, and sin; the
rewarder of them that diligently seek him; and withal, most just, and terrible in his
judgments, hating all sin, and who will by no means clear the guilty.