febrile Antonyms

afebrile extremely cold stone-cold stinging smarting siberian serene septentrional self-possessed rimy relaxed polar poised piercing peaceful numbing numb northern together tranquil as cool as a cucumber unperturbed self-controlled unflappable untroubled cold as ice bone-chilling at ease nippy hawkish carefree popsicle laid-back undisturbed wintery unruffled nipping icicled cold circumpolar chilly chilling chilled chill centered calm brumal breezy blasting bitter