Correct

笨 vs 蠢

/ bèn vs chǔn /
Strokes

Definition

笨 and 蠢 both are Adjectives, which means [stupid; foolish].

Example

笨 and 蠢 both are Adjectives, meaning not clever. The two words are interchangeable usually.
1
zhēn
bèn
  
(
chǔn
  
)
  
,
zhème
这么
jiǎndān
简单
de
zhàng
dōu
suàn
cuò
le
  

I was so stupid that I made a mistake in such a simple accounting.

2
jiāhuo
家伙
shì
bèn
  
(
chǔn
  
)
rén
  
,
zuòshì
做事
dòng
nǎozi
脑子
  

The chap is stupid for he does not use his head.

笨办法 in example ③ means "a strenuous but reliable method"; but one does not say 蠢办法 (clumsy) usually. 笨手笨脚 (intakative), 嘴笨 (not good at expressing), 发笨 (be awkward), 发蠢 (be awkward) are often used to mean not dexterous.
3
Zhè
shì
bèn
bàn
办法
  
,
dàn
jiào
比较
bǎoxiǎn
保险
  

The method is stupid,but it is safe.

4
gàn
huór  
活儿
lái
bènshǒubènjiǎo
笨手笨脚
de
  

He seems to be all thumbs at work.

5
Lǎowáng
老王
zi
肚子
yǒu
xuéwèn
学问
  
,
zhǐshì
只是
zuǐ
yǒu
diǎnr  
点儿
bèn
  
,
shàn
善于
biǎo
表达
  

Lao Wang is knowledgeable, but he is not good at expressing himself.

6
huái
怀
le
háizi
孩子
  
,
shēn
身子
yǒudiǎnr  
有点儿
bèn
  
(
chǔn
  
)
  

She is expecting a child, so she is a little bit awkward in action.

笨 and 蠢 are interchangeable to mean "clumsiness".
7
Zhèxiē
这些
jiā
家具
yòu
bèn
  
(
chǔn
  
)
yòu
  
,
bǎi
zài
xiǎo
fángjiān
房间
shì
合适
  

These furniture is large and heavy, not suitable for small rooms.

8
Zhèzhǒng
这种
xié
jiēshí
结实
shì
jiēshí
结实
  
,
shì
可是
yàngzi
样子
xiǎnde
显得
tài
chǔn
  
(
bèn
  
)
le
  

The pair of shoes is strong, but they look clumsy.