What term describes something that is extremely delicate and light, appearing too perfect for this world?

The term that best describes something that is extremely delicate and light, appearing too perfect for this world is "ethereal." This word conveys a sense of otherworldliness, suggesting that the object or being in question is not only very light and airy but also possesses an almost celestial beauty. Ethereal qualities are often attributed to things that transcend the mundane, evoking feelings of fragility and grace that seem to belong to a realm beyond our tangible experience.

Ebullient refers to a lively, enthusiastic, or excited state, which does not align with the notion of delicacy or lightness in a visual or aesthetic sense. Pallid describes something pale or lacking in color, which does not inherently convey delicateness or perfection. Prolific, on the other hand, indicates abundance, particularly in the production of offspring or results, and does not pertain to the qualities of lightness or delicate beauty. Therefore, "ethereal" perfectly encapsulates the desired qualities described in the question.