Correct

忘性

/ wàngxìng / 
Strokes

Definition

forgetfulness

Example

As a Noun

forgetfulness

1
Qiáo
瞧
nǐ
你
zhè
这
wàngxìng
忘性
  
!

What a forgetful person you are! / How forgetful you are!

2
Rén
人
lǎo
老
le
了
wàngxìng
忘性
dà
大
  
。

One tends to have a poor memory when one gets old. / One tends to get forgetful in one's old age.

3
Wàngxìng
忘性
dà
大

be very forgetful; have a poor memory