Glacial/ˈɡleɪʃl/ Definition 1 of 3Pro Tip 1/3Intensity of Cold Describes a biting cold that can be physically felt, not just a low temperature. Her fingers felt numb in the glacial water. Pro Tip 2/3Metaphorically Cold Often used to describe a person's cold behavior or unwelcoming attitude. His glacial reply left her feeling unwelcome. Pro Tip 3/3Amped Atmosphere Use 'glacial' to emphasize a chilly and intense environment, especially outdoors. The glacial air at night reminded them of the approaching winter.