misgiving qualm compunction hesitation caution difficulty doubt reluctance uneasiness perplexity squeamishness anxiety censor conscience demur falter hesitancy pause reconsideration regret reluctancy superego twinge trace bit hint touch speck shre smidgen scintilla crumb spot suspicion particle ounce tad mite dab splash lick glimmer little shade sprinkling nip spatter shadow smack ray strain spark driblet streak smell snap dram ace peanut drop iota scrap dash grain morsel atom suggestion jot modicum whit tittle tinge fragment whisper taste soupçon pinch molecule stim whiff trifle scantling fraction snippet sliver flicker dot snip shaving breath dribble granule trickle fleck piece dose mote sample shard chunk