The opposite of antipático in Spanish is simpático. While antipático describes someone who is unfriendly or unpleasant, simpático refers to someone who is friendly, likable, or pleasant.
For example, if someone is always kind and makes you feel comfortable, you would describe them as simpático. On the other hand, if someone is rude or difficult to get along with, you might describe them as antipático.
Understanding these opposites can help you better describe people and their personalities in Spanish.