Preoccupied means to be absorbed in thought or occupied with something. Antonyms for preoccupied would be unoccupied or idle, indicating a lack of busyness or engagement. Other antonyms include clear or unburdened, which signify a lack of mental or physical baggage or responsibility. The opposite of preoccupied could also be considered focused or attentive, meaning to be present and fully engaged in a task or conversation. Whatever the antonym, it is clear that being preoccupied can hinder productivity and mindfulness, whereas a lack of preoccupation allows for greater flexibility and responsiveness to the world around us.