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Suffix · forms adjectives

-brained

having a brain (or mental capacity) of a specified type; characterising the quality, power, or reliability of someone's thinking

In Spanish: de mente / de cerebroLiterary

Written by Bryan López, English teacher · Updated June 2026

What this suffix does

-brained forms compound adjectives that describe the quality, reliability, or character of someone's mental processes. Most -brained compounds in modern English are critical: scatter-brained, bird-brained, harebrained, feather-brained, crack-brained — each paints a picture of a mind that fails to work clearly, consistently, or reliably. The animal compounds (bird-brained, hare-brained, feather-brained) draw on the popular (often unfair) reputation of small animals for limited intelligence. These compounds are vivid and often humorous, belonging to the satirical and comic registers of English.

How it is pronounced

-brained

Tap the button to hear how the ending sounds. Each word in the table has its own audio.

Examples

Base word
With -brained
In a phrase
  • scatterscatter-brainedThe scatter-brained assistant had booked the meeting on the wrong day and forgotten to send the agenda entirely.
  • birdbird-brainedShe was not bird-brained at all — she had simply pretended to misunderstand in order to avoid the assignment.
  • hareharebrainedThe investors dismissed the proposal as harebrained, though three years later a competitor had built exactly that product.
  • crackcrackbrainedWhat seemed like a crackbrained theory in 1905 had, by 1920, reshaped the entire field of physics.
  • featherfeather-brainedThe feather-brained plan had been approved because no one had stopped to calculate its actual costs.

Common mistakes

scatter-brained = stupid
scatter-brained = disorganised and forgetful, not necessarily unintelligent

"Scatter-brained" describes someone whose thoughts and attention scatter in many directions at once, making them forgetful, disorganised, and easily distracted. It does not mean they are unintelligent. Many scatter-brained people are highly creative and intelligent but cannot reliably manage details, deadlines, or sequential tasks. The scattering is a failure of organisation, not of intelligence.

harebrained = relating to hair
harebrained = relating to hares (rabbits), meaning reckless and foolishly impractical

"Harebrained" refers to a hare (the fast, erratic animal), not to hair. It means recklessly impractical, impulsive, and poorly thought through. The image is of the hare's erratic, darting movement — energy and speed without direction. It is spelled "harebrained" not "hairbrained" (though the latter spelling is common due to folk etymology).

A trick to remember it

Most -brained compounds are comic insults. They work by suggesting that the person's brain resembles something small, scattered, or unreliable — a bird, a hare, a feather. But they are usually gentle insults rather than devastating ones, belonging to the register of friendly mockery or satire. "Harebrained scheme" is almost a set phrase now: it implies something impractical but not necessarily entirely without merit — just recklessly unplanned.

Practise what you learned

Exercise 1 · Form the word

Fill in: "The ___ assistant forgot the client's name, the meeting time, and where she had put the contract." (disorganised and easily distracted, unable to hold details in mind)

Hint: Scatter + brained = whose thoughts scatter in all directions.

Exercise 2 · Pick the right one

"The investors dismissed the plan as harebrained, though it eventually made the founder a billionaire." What does "harebrained" mean here?

Exercise 3 · Form the word

Fill in: "The ___ scheme had been drawn up in an afternoon without consulting any of the people it would affect." (reckless, impulsive, and not properly thought through)

Hint: Hare (animal known for erratic speed) + brained = whose brain works like a darting hare.

Frequently asked questions

What does the suffix -brained mean in English?

The suffix -brained having a brain (or mental capacity) of a specified type; characterising the quality, power, or reliability of someone's thinking In Spanish it usually maps to de mente / de cerebro.

Can you give an example of a word with -brained?

"scatter" becomes "scatter-brained". It is a typical example of the -brained suffix.

Other useful suffixes

  • -headed

    having a specified type of mental clarity, character, or state of mind

  • -minded

    having a particular way of thinking, values, or mental outlook

  • -witted

    having a specified level or quality of mental sharpness, intelligence, or quick thinking

Learn every English suffix

-tion, -ness, -ful, -ly, -able... every ending you need to understand thousands of words at once.

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