Which of the following best describes something that is 'evanescent'?

The term 'evanescent' describes something that is fleeting or temporary, often resembling qualities of vanishing or being light and airy. This word is typically used to capture the essence of things that fade away quickly, like a mist or a fleeting moment in time. In context, 'evanescent' suggests a lack of permanence, emphasizing how some experiences, beauty, or sensations are transient and cannot last forever.

The other choices describe contrasting qualities: permanence, solidity, or vulnerability, which do not align with the ethereal and temporary nature of something that is evanescent. Therefore, the correct description of something that is evanescent is indeed that it is vanishing or light and airy.