[1] : The Collaborative International Dictionary of English v.0.48

qualm \qualm\, n. as. cwealm death, slaughter, pestilence, akin
   to os.  ohg. qualm. see quail to cower.
   1. sickness; disease; pestilence; death. obs.
      1913 webster

            thousand slain and not of qualm ystorve dead.
                                                  --chaucer.
      1913 webster

   2. a sudden attack of illness, faintness, or pain; an agony.
      " qualms of heartsick agony." --milton.
      1913 webster

   3. especially, a sudden sensation of nausea.
      1913 webster

            for who, without a qualm, hath ever looked
            on holy garbage, though by homer cooked?
                                                  --roscommon.
      1913 webster

   4. a prick or scruple of conscience; uneasiness of
      conscience; compunction. --dryden.
      1913 webster
see also:
quail 

[2] : WordNet (r) 2.0

qualm
     n 1: uneasiness about the fitness of an action syn: scruple, misgiving
     2: a mild state of nausea syn: queasiness, squeamishness
see also:
scruple misgiving queasiness squeamishness 

[3] : Moby Thesaurus II by Grady Ward, 1.0

107 moby thesaurus words for "qualm":
   agitation, airsickness, all-overs, anxiety, apprehension,
   apprehensiveness, bashfulness, beef, better self, bitch, boggle,
   boggling, boycott, car sickness, challenge, complaint, compunction,
   concern, conscience, conscientiousness, conviction, demonstration,
   demur, demurral, demurrer, diffidence, disinclination, doubt,
   exception, expostulation, falter, faltering, fastidiousness,
   foreboding, funny feeling, grievance, grievance committee,
   hesitance, hesitancy, hesitation, howl, impatience,
   indignation meeting, insecurity, kick, mal de mer, march,
   meticulousness, misgiving, mistrust, modesty, motion sickness,
   nausea, nervousness, nonviolent protest, objection,
   overconscientiousness, overscrupulousness, pang, pangs,
   pangs of conscience, pause, perturbation, picketing,
   point of honor, presentiment, pricking of heart, protest,
   protest demonstration, protestation, punctilio, punctiliousness,
   qualm of conscience, qualmishness, qualms, queasiness, rally,
   recoil, reluctance, remonstrance, remonstration, scruple, scruples,
   scrupulosity, scrupulousness, seasickness, second thought,
   shrinking, shyness, sit-in, squawk, squeamishness, stickling,
   strike, suspicion, teach-in, throes, touch of conscience, twinge,
   twinge of conscience, uncertainty, unease, uneasiness,
   unwillingness, voice of conscience, vomiting, worry

Qualm >> Q Words
Qualm, definition of term: Qualm
qualm_pag1.html

Water Qualm >> W Words
Water Qualm, definition of term: Water Qualm
water+qualm_pag1.html