After the flight was cancelled, we were stranded at the airport overnight.

stranded 是动词 strand 的过去分词形式，在句中表示被动状态。strand 本意是"使搁浅、使滞留"，指因意外情况而被迫停留在某处无法离开。这里 stranded 表示"被困住、滞留"的状态。