Impetrations, which refers to the act of making a request or pleading for something, can have several antonyms based on their various contexts. One antonym could be the act of rejecting, opposing or denying a request, and some words fitting this description include refusal, denial, and rejection. Conversely, impetrations could also relate to the act of granting or fulfilling a request, and antonyms in this category or context could include failure, disappointment, and refusal to comply. Overall, the antonyms for impetrations depend on the specific context and can range from negative to positive in connotation.