Think of a body running too hot: skin burning, heart quick, unable to lie still. Feverish holds that one picture. Sometimes the heat is real illness. Sometimes it is the heat of wanting, worrying or hurrying, and the body behaves the same way.
feverish 可以想成一個「燒起來的身體」：皮膚燙、心跳快、整個人躺不住。有時候那個熱是真的在發燒，量體溫會看到數字。有時候那個熱在心裡——太想要、太緊張、太趕，人一樣靜不下來。這個字的兩個用法共用這一個畫面，只是熱從身體換到了心裡。
From the word’s history
Wiktionary records the word as fever + -ish, that is, 'having the look of a fever'. The illness sense is the plain reading; the excitement sense reuses the same look.
Wiktionary 記的組成是 fever（發燒）加 -ish（帶有…樣子的）。字面就是「帶著發燒的樣子」。真的發燒是最直接的一種樣子。心裡的燒是把同一個樣子借去用。
Wiktionary entry for feverish, packet evidence kaikki:3f6f69a190036ae4:1101918783:17723 — From fever + -ish.
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