The opposite of unintended can be intentional, deliberate, or planned. When something is unintended, it means that it was not meant to happen, but when something is intentional, it means that a person did something on purpose. The opposite of unintentional is also accidental, suggesting that something had occurred due to chance without any preconceived plan. Conversely, if something is purposeful, it means that it was done with a particular aim in mind. On the other hand, if something is predetermined or predetermined, it suggests that something was destined to happen, regardless of any effort made to the contrary. Overall, the antonyms of unintended give us an idea of the opposite extreme where actions are deliberate, planned, and predestined.