Imagine a hall where everybody starts speaking at the same moment. No one is in charge of the noise, no single voice can be followed, and anything you try to say is swallowed. That is the picture the word carries. English then does one clean thing with it: it moves the same hall inside a person, so the feelings are the crowd and the head is the room.
From the word’s history
The supplied Wiktionary entry gives Old French tumulte, from Latin tumultus, meaning noise or tumult. The word started with the sound, which is why even the inner sense still behaves like something loud.
packet 附的 Wiktionary 資料說它來自古法文 tumulte，再往上是拉丁文 tumultus（喧鬧）。這個字一開始講的就是聲音。所以就算搬進心裡，它描述情緒的方式還是「很吵、很亂」，而不是「很重、很痛」。
Wiktionary entry supplied in this batch's evidence packet (source_ref kaikki:3f6f69a190036ae4:421883964)
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