1. (a.) Of or pertaining to the region beyond the North wind, or to its inhabitants.

2. (a.) Northern; belonging to, or inhabiting, a region in very far north; most northern; hence, very cold; fright, as, a hyperborean coast or atmosphere.

3. (n.) One of the people who lived beyond the North wind, in a land of perpetual sunshine.

4. (n.) An inhabitant of the most northern regions.

Siberian algid antarctic antipodean arctic austral back of beyond below zero biting bitter bitterly cold bleak boreal brisk brumal cold cold as charity cold as death cold as ice cold as marble crisp cutting east eastbound easterly eastermost eastern easternmost freezing freezing cold frigid gelid glacial godforsaken hibernal hiemal ice-cold ice-encrusted icelike icy inaccessible inclement keen meridional nipping nippy north northbound northeast northeasterly northeastern northerly northern northernmost northwest northwesterly northwestern numbing occidental oriental out of reach out-of-the-way penetrating piercing pinching raw rigorous severe sharp sleety slushy snappy south southbound southeast southeasterly southeastern southerly southern southernmost southwest southwesterly southwestern stone-cold subzero supercooled unapproachable ungetatable untouchable west westbound westerly western westernmost winterbound winterlike wintery wintry