Siberian air-conditioned air-cooled algid arctic below zero biting bitter bitterly cold bleak boreal brisk brumal chilled cold cold as charity cold as death cold as ice cold as marble cooled crisp cutting freezing freezing cold frigid gelid glacial hibernal hiemal hyperborean ice-cold ice-encrusted iced icelike icy inclement keen nipping nippy numbing penetrating piercing pinching raw rigorous severe sharp sleety slushy snappy stone-cold subzero water-cooled winterbound winterlike wintery wintry