Retardado (en. Delayed)

/re.tarˈda.ðo/

Slang Meanings

Fool
Don't be a retard, think before you speak.
No seas un retardado, piensa antes de hablar.
Silly
If you keep doing that, they'll say you are a retard.
Si sigues haciendo eso, van a decir que eres un retardado.
Short on understanding
You don't have to be a retard to realize that.
No hay que ser retardado para darse cuenta de eso.