stupid is as stupid does
stu
ˈstju:
styoo
pid
pɪd
pid
is
ɪz
iz
as
az
az
stu
stju:
styoo
pid
pɪd
pid
does
dʌz
daz

英語での「stupid is as stupid does」の定義と意味

stupid is as stupid does
01

used to imply that a person's actions and behavior are a better indicator of their intelligence or lack thereof than their words or appearance 

ことわざ
例
Mary keeps lending money to her unreliable friend, even though she never gets paid back.  Stupid is as stupid does. 
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