始料未及

shǐliàowèijí
  1. not expected at the outset (idiom)
  2. unforeseen
  3. to be surprised by the turn of events

CEDICT

unexpected

Wiktionary

最初所沒有料想到的。

重編國語辭典

Entry Composition

1 始料 shǐliào original expectation
2 未及 wèijí
  1. to not have had time
  2. to have not yet
  3. not to touch upon