The antonyms for the word "give impetus" would be to hinder, restrain, slow down, discourage, and impede. When we talk about giving impetus, we refer to providing an encouraging force that drives progress or growth. However, when we use its antonyms, it is to describe actions that inhibit or slow down the momentum. For example, when an organization wants to give impetus to a new project, they would set achievable targets and recognize their employees' efforts. On the other hand, if they want to hinder the project's progress, they might set unrealistic targets, micromanage their employees, and hinder their creativity. It is essential to understand how antonyms can impact our language and communication.