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お前は本当に頭が悪いな
omae wa hontō ni atama ga warui na

omae = you (disrespectful)
hontō ni = seriously
atama = head
warui = bad (stupid)
na = wow (surprise)

If having a bad head means being stupid, then smart is having a good head: 頭がいい (atama ga ii).

#anime #japanese