Chillier is a word that describes a lower temperature. Some synonyms for chillier include colder, cooler, frigid, frosty, nippy, wintry and icy. These words can be used interchangeably, allowing the writer or speaker to add variety to their language while conveying the same message. For instance, the weather today is much chillier than yesterday could also be expressed using any of the synonyms listed above. These words help to paint a picture for the audience and convey the atmosphere of a place or situation. Next time you need to express the idea of a lower temperature, consider using one of the many synonyms available to add nuances and variety to your language.