不期而至

bùqīérzhì
  1. to arrive unexpectably
  2. unexpected

CEDICT

Entry Composition

1 不期 bùqī
  1. unexpectedly
  2. to one's surprise
2 而 ér
  1. and
  2. as well as
  3. and so
  4. but (not)
  5. yet (not)
  6. (indicates causal relation)
  7. (indicates change of state)
  8. (indicates contrast)
3 至 zhì
  1. to arrive
  2. most
  3. to
  4. until

Related entries

不測 bùcè
  1. unexpected
  2. measureless
  3. unexpected circumstance
  4. contingency
  5. mishap
不虞 bùyú
  1. unexpected
  2. eventuality
  3. contingency
  4. not worry about
出乎意料 chūhūyìliào (idiom) unexpected
这出乎意料地容易。

It was amazingly easy.

Source: Tatoeba

出人意料 chūrényìliào
  1. unexpected (idiom)
  2. surprising
想不到 xiǎngbudào
  1. unexpected
  2. hard to imagine
  3. it had not occurred to me
  4. who could have thought that
我想不到好的用户名

I can't think of a good username.

Source: Tatoeba

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