unexpected; inconceivable

1. 正當他們準備返航時，一次強烈的風暴阻斷了他們的歸途，而他們又遇到了意想不到的困難。
   But as they are about to return, an unprecedented storm descends on the area and blocks their way home. To make things worse something unexpected happens.
2. 一筆意想不到的遺產(chǎn)使他得以還清買房子欠下的債。
   An unexpected legacy enabled him to wipe off the debt on his house.
3. 由于想不到的原因，我不知道是否可以把約會時間由星期二改到星期五。
   Because of something unexpected, I wonder if I can change my appointment from Tuesday to Friday.
4. 恐怕這意想不到的事故會把今天的晚宴搞糟。
   I'm afraid the unexpected accident may botch up the dinner tonight.

不到的英語翻譯：