What does "qualm" mean?

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

Additional senses

  1. 2.Especially, a sudden sensation of nausea. For who, without a qualm, hath ever looked On holy garbage, though by Homer cooked Roscommon.
  2. 3.A prick or scruple of conscience; uneasiness of conscience; compunction. Dryden.

Sources