To find antonyms for the phrase "throw off balance," we need to look for words that describe actions that have the opposite effect. One antonym for "throw off balance" could be "calm." When we are calm, we are often in a state of emotional and mental balance. Another possible antonym could be "steady." If we are steady, we are firmly grounded and unlikely to be easily thrown off balance. A third antonym could be "centered." When we are centered, we are grounded and focused, which makes it less likely that we'll be thrown off balance by outside forces. In short, the antonyms for "throw off balance" describe states of emotional and mental stability.