"Redounded" is a verb that refers to an effect or result that affects someone or something positively or negatively. The synonym for "redounded" can be "rebounded," which means a positive rebounding effect. Another word that can replace "redounded" is "echoed," which refers to a repetition of a sound or an effect similar to the original. "Amplified" is another synonym that means increasing or exaggerating an effect or outcome. "Contributed," on the other hand, means playing a role in creating or achieving a particular outcome. Lastly, "yielded" means producing or generating a result or output from a particular action or decision. These synonyms add variety and depth to the English language when expressing the effects of a particular situation or action.