Banefulness refers to the state of being harmful or destructive. The opposite of banefulness is goodness or beneficial. Goodness can refer to anything that brings positive effects or contributes positively to the welfare of someone or something. Beneficial, on the other hand, refers to something that promotes wellbeing, advantage or productivity. Other antonyms for banefulness include helpfulness, advantageousness, gainful, profitable, useful, and productive. Each of these words suggests a quality or characteristic that is opposed to the harmful effects associated with banefulness. In essence, antonyms for banefulness all connote positivity, wellbeing, and advantage.