Correct

牢靠

/ láokào / 
Strokes

Definition

firm and solid/robust/reliable

Example

As an Adjective

firm; strong; sturdy; steady

1
Zhè
这
shūjià
书架
bùgòu
不够
láokào
牢靠
  
,
kuài
快
sǎnjià
散架
le
了
  
。

The bookshelf is not strong enough. It's going to break.

2
Bǎ
把
tīzi
梯子
fàng
放
láokào
牢靠
xiē
些

fix the ladder steadily

As an Adjective

safe; dependable; reliable

3
Pài
派
tā
他
qù
去
bàn
办
zhè
这
jiàn
件
shìqing
事情
bǐjiào
比较
láokào
牢靠
  
。

It's relatively safer to send him to handle the affairs.

4
Bànshì
办事
láokào
牢靠

dependable/reliable in handling matters