/ˌkɑːnstɚˈneıʃən/ noun [noncount]
formal : a strong feeling of surprise or sudden disappointment that causes confusion
The candidate caused consternation among his supporters by changing positions on a key issue.
Much to her parents' consternation, she had decided to not go to college.
They stared at each other in consternation [=dismay], not knowing what to do.
Useful english dictionary. 2012.