Undeliberate is an adjective used to describe actions that are not intentional or thought through. Antonyms for this word would include deliberate, intentional, calculated, planned, and premeditated. These words describe actions that are done with purpose and forethought. Deliberate implies a careful consideration of options and consequences. Intentional indicates a determined and purposeful action. Calculated suggests a measured and strategic approach. Planned implies a specific design or purpose. Finally, premeditated refers to an action that is thought through and planned in advance, especially with criminal intent. By using antonyms for undeliberate, we can better convey the intentionality and purpose behind specific actions.