What is another word for "qualm"?

Roget's Thesaurus (1911) lists these synonyms for "qualm": alacrity, aversation, averseness, backwardness, conscience, delicacy, demur, disinclination, dislike, dissent, hesitation, indifference, indisposedness, indisposition, indocility, irresolution, nolition, nolleity, obstinacy, readiness, recoil, refusal, reluctance, renitence, renitency, scruple, scrupulosity, shrinking, slowness, twinge, want.