The antonyms for the word "down-to-earthness" could be terms like otherworldliness, idealism, fantasy or impracticality. While the former is associated with being grounded and pragmatic, the latter signifies a state of being disconnected from reality or unrealistic in one's approach. Other antonyms could include extravagance, superficiality or self-indulgence, which are characterized by an excessive focus on material possessions, appearance, or personal gratification, often at the expense of one's overall well-being or happiness. Ultimately, the antonyms for "down-to-earthness" reflect a range of different behaviors and attitudes that are diametrically opposed to being practical, grounded, or having a realistic outlook towards life.