Antonyms for the word "one's discretion" could include being under obligation, being required, being compelled, being mandated, or being forced. When an action is done at someone else's discretion, it means they have the power and authority to make the decision. Therefore, when something is done under obligation, there is no freedom or autonomy as the obligation is a requirement that must be fulfilled. Additionally, being required implies that something is necessary or mandatory, and there is no choice in the matter. Being compelled, mandated, or forced also implies that someone is being pressured or coerced into doing something, without any choice or control over the situation.