/ ˌkɒnstəˈneɪʃn; NAmE ˌkɑːnstərˈn-/ noun
[ U ] ( formal ) a worried, sad feeling after you have received an unpleasant surprise
SYN dismay :
The announcement of her retirement caused consternation among tennis fans.
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WORD ORIGIN
early 17th cent.: from Latin consternatio(n-) , from the verb consternare lay prostrate, terrify.