Correct

不意

/ bùyì / 
Strokes

Definition

unexpectedly/unawareness/unpreparedness

Example

As a Verb

not expect

1
Tāmen
他们
bùyì
不意
diūshī
丢失
zhèngjiàn
证件
  
,
zhǐhǎo
只好
bàntú
半途
fǎnhuí
返回
  
。

The unexpected loss of their credentials forced them to return before they reached their destination.

2
Bùyì
不意
tā
他
jiùbìngfùfā
旧病复发
  
,
yī
一
shí
时
nányǐ
难以
chéngxíng
成行
  
。

A sudden relapse of the illness delayed his planned trip.