Retund means to make something less sharp or to make it dull. It can also refer to the process of blunting or reducing the impact or effectiveness of something. Some synonyms for the word retund include blunt, dull, weaken, deaden, soften, and reduce. Other related words might include desensitize, dampen, mitigate, temper, or lessen. Depending on the context, you might also use terms like curb, restrain, or moderate to indicate a similar idea of reducing or holding back an effect or impact. When writing or speaking, choosing the right synonym for retund can help you convey your meaning more precisely and effectively.