qualm

ot noun

1. A prick of the conscience; a moral scruple, a pang of guilt. (Now often in negative constructions.) This lawyer has no qualms about saving people who are on the wrong side of the law.
2. A feeling of apprehension, doubt, fear etc.
3. A sudden sickly feeling; queasiness.
4. Mortality; plague; pestilence.

fe’l verb

1. To have a sickly feeling.