You can think of frigid as one step past the edge of comfort. Cool is pleasant, cold is ordinary, and frigid is the point where you cannot stay. Start with air so cold that your hands stop working. Then move that same feeling off the weather and onto a person: a look, a voice or a room where the warmth has simply been shut off. Nothing in the word ever changes except what it is pointed at.
From the word’s history
Frigid was borrowed from Latin frigidus, meaning cold, which comes from frigeo, to be cold, and frigus, coldness. The word arrived in English carrying one idea — cold — and every later use is that idea aimed somewhere new.
frigid 借自拉丁文 frīgidus（冷），frīgidus 來自 frīgeō（覺得冷）和 frīgus（寒冷）。這個字進到英文時只帶著一件事：冷。後來的每個用法，都是同一個「冷」被指向不同的對象。
Wiktionary (kaikki snapshot 3f6f69a190036ae4), frigid adj entry, etymology_text: "Borrowed from Latin frīgidus (cold), from frīgeō (to be cold), from frīgus (cold, coldness), from Proto-Indo-European *sríHgos."
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