The antonyms for the word "most sniveling" would be confident, self-assured, strong, assertive, and brave. Sniveling refers to someone who cries or whines in a weak, self-pitying manner. Therefore, the opposite of this would be someone who exudes strength and courage or takes charge of a situation. A confident person is not afraid to assert themselves and stand up for what they believe in. Self-assured individuals are comfortable in their own skin and display a positive self-image. People who exhibit bravery in the face of adversity are willing to take risks and handle challenges without backing down.