Antonyms for the phrase "weighs heavy upon" include lightness, ease, and insignificance. When something weighs heavy upon one's mind or heart, it can cause great anxiety, stress, and burden. However, its antonyms suggest the opposite - a sense of calm, relaxation, and freedom. Lightness alludes to the absence of weight or the lack of pressure. Ease suggests an absence of difficulty or hardship. And insignificance denotes a lack of importance or relevance. When we release what weighs heavy upon us and embrace its antonyms, we can enjoy a lighter, more peaceful existence.