Correct

大约摸

/ dàyuē mō / 
Strokes

Example

As an Adverb

about

1
Tā
他
dàyuē
大约
mō
摸
hái
还
bù
不
zhīdào
知道
zhè
这
jiàn
件
shì
事
  
。

He is probably unaware of this.