It is important to note that the word "re tardo" is a derogatory term that should not be used. However, there are many other words that can be used to express intelligence or cognitive abilities. Some synonyms for smart or intelligent include brilliant, clever, astute, nimble-witted, sharp, and savvy. On the other hand, some words that can be used to describe individuals with intellectual or cognitive disabilities in a respectful way include having a developmental disability, having a cognitive impairment, or having special needs. It is important to use language that is inclusive and respectful of all individuals, regardless of their abilities.