Sunday, 6 September 2026

The History of Words Used for Intellectual Disability

 


Why have the words changed?

The words used to describe people with intellectual disabilities have changed over time.

Some words that were once used by doctors, teachers, institutions and the law are now considered offensive.

This is because language can affect how people are treated.

Today, the respectful term is usually:

Intellectual disability

In the UK, the term learning disability is also commonly used to mean intellectual disability.


A Historical Timeline

🕰️ Before the 1900s

Words such as “idiot” and “imbecile” were used in medical, legal and everyday language.

These words did not always have the same meaning that they have today.

Over time, they became increasingly associated with people who were considered to have intellectual impairments.

These words are now offensive when used to describe a person with an intellectual disability.


🧠 Late 1800s and early 1900s

The term “feeble-minded” became widely used.

It was used as a broad term for people who were thought to have intellectual or developmental impairments.

However, it was also used very broadly.

People could be placed into categories because of their behaviour, education, social circumstances or the opinions of professionals.


📊 Moron, Imbecile and Idiot

As intelligence testing became more common, some professionals tried to divide people into different levels.

Moron

The word “moron” was introduced as a psychological classification in the early 1900s.

It was used for people who were considered to have a higher level of intellectual ability within the historical classification system.

The term later became an insult.

It should not be used as a modern medical term.


Imbecile

“Imbecile” was another historical classification.

It was used for people considered to have a greater degree of intellectual impairment than those classified as “morons.”

The meaning was not exactly the same everywhere.

The word later became a common insult.

It is now outdated and offensive.


Idiot

“Idiot” was historically used as a classification for people considered to have the most significant intellectual impairments.

The meaning changed over time.

Today, “idiot” is an insult and is not an appropriate term for a person with an intellectual disability.


⚠️ Other Historical Terms

There were many other words and classifications.

Cretin

“Cretin” was once a medical term associated particularly with severe physical and intellectual impairment caused by conditions such as untreated congenital hypothyroidism.

It later became a derogatory word.

It should not be used to describe a person today.


Amentia

Amentia was a historical medical term.

It was sometimes used when doctors were trying to distinguish intellectual or cognitive difficulties that were thought to have been present from birth from conditions that developed later.

Medical understanding has changed considerably since then.


Moral imbecile

“Moral imbecile” was a particularly harmful historical classification.

It was used to describe people who were considered to have poor behaviour, morality or social judgement.

The concept was extremely subjective.

People could be labelled because they did not conform to the social expectations of the time.

Such classifications were sometimes connected with institutionalisation and eugenic policies.

This is an important example of how labels could be used to discriminate against people.


👥 The “Defective” Class

Historically, people with different disabilities and health conditions were sometimes placed into broad groups.

These could include:

  • People with intellectual disabilities

  • Deaf people

  • Blind people

  • People with epilepsy

  • People with mental health conditions

  • People with other disabilities

They could be described using terms such as “defective” or “mental defective.”

These classifications did not reflect the way we understand disability today.

They often grouped very different people together.


🔄 How Did the Language Change?

During the 20th century, some of these old words became insults.

Professionals therefore introduced new terminology.

One important term was:

Mental retardation

This became an accepted clinical term during the 20th century.

It was used for many years in medical, educational and legal settings.

However, the word “retarded” eventually became widely used as an insult.

The terminology was therefore changed again.


✅ Intellectual Disability

Today, intellectual disability is the preferred term in the United States and many other places.

It recognises that a person has difficulties with:

  • Intellectual functioning

  • Learning

  • Problem-solving

  • Everyday adaptive skills

But a diagnosis does not define the whole person.

A person is not their diagnosis.

For example:

❌ “She is an intellectual disability.”

Better:

“She has an intellectual disability.”

Or:

“She is a person with an intellectual disability.”


🇬🇧 UK Terminology

There is an important difference between the UK and the United States.

In the United Kingdom, the term learning disability is commonly used for what is called intellectual disability in the United States.

In the United States, “learning disability” usually means a specific difficulty with learning, such as:

  • Dyslexia

  • Dyscalculia

  • Dysgraphia

Therefore, it is important to consider which country is using the terminology.


❤️ Why Language Matters

The history of disability terminology shows us that words can have a powerful effect.

A word may begin as a medical classification.

Over time, it may become a label.

Later, it may become an insult.

This is sometimes described as the “euphemism treadmill.”

Changing a word does not automatically remove discrimination.

We also need to change:

  • Attitudes

  • Policies

  • Services

  • Education

  • Accessibility

  • Opportunities

  • The way people with disabilities are treated

Most importantly:

People are more than their diagnosis or disability.

We should use respectful language and, whenever possible, listen to how people describe themselves.

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