expression, noun-modifying (irregular)
Prenominal expression used to describe events, situations, or outcomes that were not anticipated. Slightly formal or literary tone due to the classical negative せぬ.
See also: 予期
予期せぬトラブルが発生した。
An unexpected problem occurred.
予期せぬ来客に驚いた。
I was surprised by the unforeseen visitor.