Idiot vs. Moron: What's the Difference? March 5, 2007
Maggie Koerth-Baker Mental Floss

The Dilemma: You want to assail someone's intelligence, but you don't know quite what word to use, which calls into question your own intellect.

Materials Needed: An IQ test would be helpful, but you can get by on just your wits-provided you have enough of them.

People You Can Impress: Well, idiots and morons both, for starters. But also psychologists. And you really, really need to impress psychologists, because-as you'll see-you really don't want them to think you're an idiot.

Quick Trick: These days, the words are completely synonymous. But back in the dark days of psychology (which is to say until about 30 years ago), there was a difference, and here's the quick trick psychologists used: Ask a question. If your subject answers, they're a moron at worst. If they don't answer, you might have an idiot on your hands.

The Reason: Anyone who says that political correctness never accomplished anything worthwhile should take a long, hard look at the lot of the idiot. In 1911, French psychologists Alfred Binet and Theodore Simon created the first modern intelligence test, which calculated IQ based on whether children could accomplish tasks like pointing to their nose (honestly) and counting pennies. The concept of "IQ" followed soon after, and psychologists fell so deeply in love with the scientific nature of the tests that they created classification systems. Any child with an IQ of above 70 was considered "normal," while kids above 130 were considered "gifted." To deal with kids below 70, psychologists invented a nomenclature of retardation. Those with IQs between 51 and 70 were called morons. Morons had adequate learning skills to complete menial tasks and communicate. Imbeciles, with IQs between 26 and 50, never progressed past a mental age of about six. And the lowest of all were the idiots, with IQs between 0 and 24, who were characterized by poor motor skill, extremely limited communication, and little response to stimulus.

The moron/imbecile/idiot classification remained popular, amazingly, until the early 1970s, when people started to note that the developmentally disabled have enough difficulties without being saddled with condescending labels. The 70s saw the move away from institutionalizing the developmentally disabled, and it has since been shown that the majority of people with IQs below 70 can lead productive and independent lives. Not to sound like Tom Cruise or anything, but the real morons in this story were the psychologists. Today, the classification system is one category broader-moron, imbecile, and idiot have been replaced with mild, moderate, severe, and profound retardation-and diagnostic factors other than IQ are considered in making a diagnosis.

Also Good to Know: The doubly offensive term "Mongolian Idiot," which in the 19th and early 20th centuries was an actual, literal diagnosis, derives from people's belief that individuals with Down Syndrome-with their wide-set eyes and round faces-resembled Mongolians. In fact, before the British physician JHL Down (1829-1896) lent his name to the chromosomal syndrome, Down Syndrome was known merely as "Mongolism."

And there you have it. Now you know whether you're working with idiots or morons. Need more clarification in your life? Check out What's the Difference, a mental_floss book written by John Green, Chris Connolly, Christopher Smith, and (yours truly) Maggie Koerth-Baker.

  • blockhead
  • bonehead
  • knucklehead
  • muttonhead
  • pinhead
  • meathead
  • cretin
  • dimwit
  • nitwit
  • halfwit
  • twit
  • dummy
  • dork
  • dumbbell
  • dunce
  • fool
  • idiot
  • ignoramus
  • imbecile
  • jerk
  • kook
  • moron
  • nincompoop
  • ninny,
  • out to lunch
  • simpleton
  • stupid
  • tomfool
  • puddle of ignorance
  • intellectual midget
  • microscopic little minds

An idiot is a stupid person with a mental age below three years,

A moron is a stupid person with a mental age of between seven to twelve years

Its hard to believe that (s)he beat out half a billion other sperm.

If brains were chocolate, he wouldn't have enough to fill an M&M.

Room temperature IQ

Barely able to tie his own shoe laces

It's only by the grace of god that this person can wipe themselves

This is the kind of person that gets runover by a train.

He's a good candidate to fall off a cruiseliner on an ocean voyage.

These people should be invited to the Soylent Green factory.

They are free of the ravages of intelligence and unencumbered by skills

Listening to these people make your brain cells commit suicide

He has a corner on stupidity.

A rumor has it that he was a siamese twin that got both brains.

Jelly fishes have existed for 650 million years without brains. There's still some hope for you.

Dumber than a tree stump

As sharp as a sack of wet mice.

Has the IQ of a french fry.

Primeval creatures with tiny little hearts and stupid lizard brains.

Immune to learning from his own mistakes.

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