an uneasy feeling or pang of conscience as to conduct; compunction

He has no qualms about lying.

a sudden feeling of apprehensive uneasiness; misgiving

a sudden qualm about the success of the venture.

a sudden sensation or onset of faintness or illness, esp. of nausea.

noun

approval , comfort , contentedness

noun

agitation , anxiety , apprehension , compunction , conscience , demur , disquiet , foreboding , hesitation , indecision , insecurity , misdoubt , misgiving , mistrust , nervousness , objection , pang , perturbation , presentiment , regret , reluctance , remonstrance , remorse , scruple , suspicion , twinge , uncertainty , unease , uneasiness , reservation , doubt , faintness , feeling , nausea , pall , sickness