Correct

机警

/ jījǐng /
Strokes

Definition

perceptive/astute/sharp/sharp-witted/vigilant/alert

Example

As an Adjective

alert; sharp-witted; vigilant

1
zhēn
jǐng
机警
  
,
xiàzi
下子
jiù
zhù
注意
dào
ge
那个
jié
细节
  

It was very sharp of him to have noticed that detail right away.

2
jǐng
机警
shìbīng
士兵

vigilant soldier

3
jǐng
机警
de
nánhái
男孩

alert boy

4
jǐng
机警
de
huí
回答
  
/
fǎn
反驳

sharp-witted reply/retort

5
Bǎochí
保持
jǐng
机警

have/keep one's wits about one