What is another word for very cold?
Pronunciation: [vˈɛɹɪ kˈə͡ʊld] (IPA) 
Very cold is a commonly used expression to describe a temperature that is below the freezing point of water. However, there are several synonyms that can be used to articulate the extreme chilliness of the weather more effectively. These include frigid, icy, bitter, arctic, nippy, chilling, piercing, bone-chilling, freezing, frosty, and glacial. Each word brings its unique nuance to the description, for instance, frigid connotes a stony cold, icy suggests a frozen and slippery state, and bone-chilling alludes to a cold that penetrates the core and leaves one shuddering. These synonyms can be used interchangeably, depending on the context and the degree of coldness one wants to portray.
