scruple

[1]	pause , falter , hesitate , vacillate , have doubts/compunction (about) , demur , waver , shrink from/at , have misgivings/qualms (about/over) , be loath/loth (to) , think twice (about) , stick at , be reluctant , balk (at) , have scruples (about)

[1]	compunction , qualm , reluctance , misgiving , second thoughts , doubt , (twinge of) conscience , hesitation , uneasiness , discomfort , squeamishness
[2]	qualm , misgiving