One way to hold queasy: the stomach turning over, just before anything happens. Nothing has come up yet; you only know that it could. English keeps that same turning feeling when it talks about a conscience — you are not hurt, and nothing has gone wrong for you, but something being done sits badly inside.
Queasy comes from Middle English coysy, possibly related to Old Norse kveisa, a boil, and perhaps shaped by Old French coisier, to hurt or make uneasy. Both trails point at something inside the body being wrong.
queasy 來自中古英文 coysy。來源不確定：可能跟古諾斯語 kveisa（癤、腫痛）有關，也可能受古法文 coisier（弄傷、使人不安）影響。兩條線索都指向「身體裡有個地方不對勁」，跟今天的核心畫面正好接得上。
Wiktionary entry supplied in this packet (source_ref kaikki:3f6f69a190036ae4:773221649:10252), which itself hedges with 'possibly' and 'perhaps'.
Two branches
胃裡的翻動
這一支是那個畫面的字面版本：真的是胃在翻，暈船、暈車、吃太油的時候最常出現。
adjective · B2
Feeling sick in your stomach, as if you might vomit — the unsettled feeling you get on a rocking boat or a winding road. The thing that causes it is usually named with make: the smell made him queasy.
想吐的／噁心的
良心上的翻動
同一種翻動被搬到心裡：身體沒事，但眼前這件事讓你裡面過不去，所以你不想沾。
adjective · C1
Feeling uncomfortable about something because it seems morally wrong. You are not ill; something being said or done leaves you uneasy inside. It is usually followed by about, and Longman marks this use as American English.
心裡不安的