Overwhelm is a verb that means to overpower, to defeat or to submerge. Antonyms, on the other hand, are words that have opposite meanings to the given word. The antonyms for the word "overwhelm" are underwhelm, relax, comfort, soothe, calm, delight, satisfy, please, and compose. Underwhelm means to fail to impress or to have a disappointing impact. Relax is to rest and to be at ease after a period of stress. Comfort means to provide solace or ease the sense of distress. Soothe means to alleviate some pain or stress. Calm is to create a peaceful and tranquil environment. Delight and satisfy are to provide pleasure and contentment. Compose is to stay in control and balanced.