The term "blood-warm" is used to describe a temperature that is between lukewarm and body temperature. Its antonym would be a word that describes a temperature that is either extremely hot or extremely cold. For example, some antonyms of blood-warm are freezing, chilly, icy, cold, arctic, frigid, frosty, glacial, and wintry. Conversely, some other antonyms of blood-warm are boiling, scorching, boiling hot, roasting, sizzling, baking, sweltering, burning, and torrid. Whether it's the extreme cold of winter or the scorching heat of summer, there are many antonyms that describe temperatures far different than blood-warm.