The term "nippiness" refers to the quality of being chilly or cold. Its antonyms include terms like warmth, heat, humidity, and sultriness. These words describe various qualities of warmth and offer alternatives to the feeling of nippiness. Similarly, terms like mildness, calmness, stillness, and tranquility also offer a relief from the harshness of nippiness. Although nippiness may be refreshing and invigorating at times, its antonyms provide comfort and relaxation. So, while nippiness might be suitable for certain situations, having a choice of alternatives helps in adjusting to different weather conditions and environments.