"Retardo" is a term that is considered derogatory and offensive to many people, as it is often used to mock or insult individuals with intellectual disabilities. Therefore, it is important to avoid using this term and instead opt for more appropriate and respectful language.
There are several synonyms that can be used in place of "retardo," depending on the context and the desired meaning. Some possible options include "delayed," "slow," "challenged," "disabled," "mentally impaired," "cognitively challenged," or "intellectually disabled." It is important to be sensitive to the feelings and experiences of those who may be affected by such language, and to use words that promote acceptance, inclusion, and respect for all individuals.