puz·zle·ment 
/ˈpʌzəlmənt/ noun
/ˈpʌzəlmənt/ noun formal 1 [noncount] : a feeling of being confused because something is difficult to understand
▪ The cause of the accident has been a source of puzzlement. ▪ The explanation only increased their puzzlement. 2 [singular] chiefly US : something that is difficult to understand
▪ The cause of the accident is a puzzlement. [=puzzle]
▪ The cause of the accident has been a source of puzzlement. ▪ The explanation only increased their puzzlement.
▪ The cause of the accident is a puzzlement. [=puzzle]
