cold

noun
A low temperature, especially in the atmosphere; cold weather; a cold environment. (my teeth chattered with the cold)
A common viral infection in which the mucous membrane of the nose and throat becomes inflamed, typically causing running at the nose, sneezing, a sore throat, and other similar symptoms. (Suzie's got a cold)

adjective
Of or at a low or relatively low temperature, especially when compared with the human body. (a freezing cold day)
Lacking affection or warmth of feeling; unemotional. (how cold and calculating he was)
(of the scent or trail of a hunted person or animal) no longer fresh and easy to follow. (the trail went cold)
Without preparation or rehearsal; unawares. (going into the test cold)