retard

Originally, the word "retard" simply meant to slow down or delay a process, like slowing the growth of a plant or slowing a chemical reaction. Think of it as putting on the brakes. Over time, though, this word became strongly linked to a highly offensive slur aimed at people with intellectual disabilities.

Because of this hurtful history, using "retard" to describe a person's intelligence is now widely seen as unacceptable and harmful. The original technical meaning still exists in a few specific fields, such as "flame retardants" or mechanical timing, but the word carries a lot of harmful baggage because of its use in abuse and discrimination. You should avoid using it in any context relating to people. Instead, use respectful and accurate language when talking about intellectual disabilities.

The word "retard" has a complex and troubling history. Derived from the Latin retardare, meaning "to slow down," it was once used neutrally to describe a decrease in speed or progress, for instance in slowing the ripening of fruit or delaying the spark in an engine. In scientific contexts, especially in the 19th and early 20th centuries, "retarded" was also used as a medical term for people with intellectual disabilities.

However, this usage quickly became problematic. The term was increasingly employed as a derogatory slur, used to mock, belittle, and dehumanize people with cognitive differences. This harmful association led to widespread advocacy for the removal of "retard" and its variations from everyday language.

Today, using "retard" or "retarded" to describe someone's intelligence is deeply offensive. It perpetuates stigma, reinforces negative stereotypes, and causes significant pain. Instead, respectful and person-first language should always be used, for example, "a person with an intellectual disability."

While you will still encounter the technical meaning of "slow down" in specialized fields like chemistry, mechanics, or fire safety, it is important to understand the word's harmful legacy. Avoid using it in any context that could be understood as discriminatory or disrespectful. The word serves as a reminder of how language can evolve to cause harm, even when it begins with a neutral meaning.