Qualm

Part of speech: noun (n.)

1. Sickness; disease; pestilence; death. [Obs.] thousand slain and not of qualm ystorve [dead]. Chaucer.

2. A sudden attack of illness, faintness, or pain; an agony. " Qualms of heartsick agony." Milton.

3. Especially, a sudden sensation of nausea. For who, without a qualm, hath ever looked On holy garbage, though by Homer cooked Roscommon.

4. A prick or scruple of conscience; uneasiness of conscience; compunction. Dryden.