The word "re-percussion" refers to the negative consequences or results of an action. Antonyms for this word would be positive outcomes, good consequences, or benefits. Other antonyms could include success, achievement, or progress. In contrast to re-percussion's meaning of a harmful effect, antonyms could suggest an advantageous effect, an improvement, or advancement. Words such as reward, fulfillment, or accomplishment would also all be antonyms of re-percussion. It's important to have a strong understanding of both words with positive and negative connotations to communicate effectively and concisely.