accidental

accidental的解释
a. 意外的,偶然的
accidental的例句
Our meeting was quite accidental.
我们的相遇是很偶然的。

A sequence of events that although accidental seems to have been planned or arranged.
巧合，凑巧虽是偶然的，但似乎是经计划或安排的一系列事件