Perplexity is a feeling of being confused and frustrated because you do not understand something. He began counting them and then, with growing perplexity, counted them a second time
The quality or state of being perplexed or puzzled; complication; intricacy; entanglement; distraction of mind through doubt or difficulty; embarrassment; bewilderment; doubt
The perplexities of something are those things about it which are difficult to understand because they are complicated. the perplexities of quantum mechanics
If something perplexes you, it confuses and worries you because you do not understand it or because it causes you difficulty. It perplexed him because he was tackling it the wrong way. if something perplexes you, it makes you feel confused and worried because it is difficult to understand = puzzle (perplex (14-17 centuries), from perplexus, from plexus )