Impetration is an archaic word that means to obtain something through prayer or supplication. Antonyms for impetration can be found in words that suggest denying, rejecting or dismissing such requests. Words like refusal, denial, rejection, unrealization, unattainment, and dismissal can be used as antonyms for impetration. When someone makes a request or prayer, and the request is not granted, the antonyms come into play. The person may feel rejected, unrealized, or unattained in their efforts. It is essential to know the opposites of impetration to express oneself better and have a broader understanding of the word.