qualm has definitions from the field of medicine
1
[ noun ] uneasiness about the fitness of an action

Synonyms

misgiving scruple

Used in print

(James Boylan, "Mutinity"...)

Even Hudson , experienced in Arctic sailing and determined as he was , must have had qualms as he slid down the Thames .

Related terms

anxiety misgive scruple

2
[ noun ] (medicine) a mild state of nausea

Related terms

nausea

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