Whistly is a descriptive term often used to describe a high-pitched sound made by wind or other objects. This term may be seen as limiting, but there are many synonyms that can be used to describe the same phenomenon. For example, "sibilant" refers to a hissing sound, while "shrill" and "prickly" both suggest a sharpness or intensity to the sound. "Squealing" and "whining" both evoke a sense of discomfort, while "wheezing" and "sighing" may suggest a quieter, more atmospheric sound. Ultimately, the choice of synonym will depend on the specific qualities of the noise being described and the effect the writer is hoping to achieve.