What is another word for sub zero?
Pronunciation: [sˈʌb zˈi͡əɹə͡ʊ] (IPA) 
Sub zero refers to a temperature that is below freezing point, which is 0°C or 32°F. However, there are several other synonyms that can be used to describe the same temperature level. Some of these include frigid, icy, chilly, bitter, freezing, frosty, harsh, glacial, and arctic. The terms can be used interchangeably depending on the context and the preference of the user. They help to paint a vivid picture of the extreme cold temperatures that can be experienced in certain regions of the world, or during winter seasons. Understanding these synonyms is essential in effective communication as it helps to avoid repeating the same word repeatedly.
