frigid

Frigid comes from Latin frīgidus, meaning 'cold,' which was formed from the verb frīgeō, 'to be cold.' That verb in turn traces back to Latin frīgus, 'cold, coldness,' rooted in Proto-Indo-European *sríHgos.

The word passed directly from Latin frīgidus into English as frigid, keeping its core meaning of coldness intact.

Frigid shares its root with Latin frīgus itself, the noun for 'cold' that gave rise to the verb frīgeō and eventually to frigid.