Unmeditated means without prior thought or preparation. The antonyms for unmeditated include premeditated, intentional, deliberate, conscious, calculated, planned, thoughtful, considered, and purposeful. When someone does something premeditated, it means that they did so with previous intentions or planning. Intentional means that the action was done on purpose or with a specific goal in mind. Deliberate means that the action was done with careful thought and consideration. Conscious means that the person was aware of their actions and the consequences. Calculated refers to actions done with a plan in mind. When an action is considered, it means that it was thought about carefully before taking. Finally, when something is purposeful, it means that there was an intended goal or objective behind the action.