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.
From the word’s history
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'.
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