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to act like a peabrain

to act like a peabrain

9.6
Behave in a silly, not very smart way
  • idiom
  • Offensive
translation icon : actuar como un idiota (ofensivo, informal)
  • Please stop acting like a peabrain and help us solve the problem.

Examples

  • She realized she was acting like a peabrain when she forgot her keys for the third time.

  • She always acts like a peabrain when she gets nervous.

  • If you keep acting like a peabrain, you'll never finish your work on time.

  • Don't act like a peabrain!

  • If you keep acting like a peabrain, you'll struggle to make good decisions.

  • He was acting like a peabrain when he thought it was safe to cross the street without looking.

  • Don't act like a peabrain; think through your choices before making a decision.

Synonyms

to be silly
vsto act like a peabrain
88 2.1

Act in a foolish or playful way without taking things seriously

is senseless in a negative way rather than playful silliness
to act a fool
vsto act like a peabrain
  • Informal
3 8.0

To behave in a silly or embarrassing way to get attention

is senseless without the aim of seeking attention
to be a buffoon
vsto act like a peabrain
  • Offensive
2 8.1

To act in a silly, embarrassing way to make people laugh

is senseless foolishness rather than deliberate buffoonery for show
to be a tosser
vsto act like a peabrain
  • Offensive
1 9.9

To behave in a rude, stupid way

is foolish or senseless without the insulting tone
to act like a putz
vsto act like a peabrain
  • Offensive
1 9.9

To behave in a silly or clumsy way

is senseless rather than primarily incompetent at tasks
to be a berk
vsto act like a peabrain
  • Offensive
1 9.9

To act in a foolish way

is senseless without the explicitly insulting label
to play silly buggers
vsto act like a peabrain
  • Offensive
1 9.9

Act in a foolish, annoying way instead of being serious

is senseless action rather than deliberate distraction or annoyance
to act like an assmunch
vsto act like a peabrain
  • Offensive
9.9

Behave in a rude, annoying, and foolish way toward other people

is foolish or senseless without deliberate nastiness
to act like a clodpole
vsto act like a peabrain
  • Offensive
9.9

To behave in a foolish and clumsy way

is simply senseless foolishness rather than physical clumsiness
to act like a dingus
vsto act like a peabrain
  • Offensive
9.9

To behave in a foolish, clumsy way that makes people laugh

is more about senselessness than mere awkwardness
to act like a ditz
vsto act like a peabrain
  • Offensive
9.6

Behave in a silly, careless way to avoid serious talk

is plain senseless behaviour rather than superficial absentmindedness
to act like a booger brain
vsto act like a peabrain
  • Offensive
9.9

To behave in a silly and immature way

is senseless in a general way, not specifically childish
to act like an arseface
vsto act like a peabrain
  • Offensive
9.9

To behave in a rude and annoying way

is senseless without the added rudeness or insult
to be such a barmpot
vsto act like a peabrain
  • Offensive
9.9

Act in a foolish way

is senseless foolishness rather than broader irrationality
to be a nerk
vsto act like a peabrain
  • Offensive
9.9

To do silly things that make problems for yourself

is senseless behaviour rather than just poor effectiveness
to act like a dorkus
vsto act like a peabrain
  • Offensive
9.9

To behave in a silly, awkward way that looks foolish

is senseless without the specifically awkward or ridicule‑inviting tone
to act like a tosser
vsto act like a peabrain
  • Offensive
9.9

To behave rudely or foolishly in a way that annoys others

is general senselessness rather than specifically poor judgment
to be a dimmie
vsto act like a peabrain
  • Offensive
9.9

To act in a silly or stupid way

is senseless behaviour rather than focused on low intellect
to act like an airhead
vsto act like a peabrain
  • Offensive
8.6

To behave in a silly way without thinking when nervous or tired

is broadly senseless rather than merely absentminded or lightheaded
to be a skaapie
vsto act like a peabrain
  • Offensive
9.9

Act in a foolish way because you trust people too easily

is senseless without the naive or innocent aspect
to act like a doylem
vsto act like a peabrain
  • Offensive
9.9

Behave in a silly, clumsy way

is senseless conduct rather than focused on clumsiness or insult
to be a numskull
vsto act like a peabrain
  • Offensive
9.5

To do something silly without thinking

is senseless but may not imply impulsive thoughtlessness
to act like a barmpot
vsto act like a peabrain
  • Offensive
9.9

To behave in a silly or wild way that makes people laugh

is simple senseless behaviour rather than extreme eccentricity
to act like a dipstick
vsto act like a peabrain
  • Offensive
9.9

To behave foolishly or clumsily

is senseless rather than focused on clumsy ineptitude
to be a wally
vsto act like a peabrain
  • Offensive
9.9

Act in a silly, embarrassing way

is senseless without the specific embarrassing awkwardness
to be a nimrod
vsto act like a peabrain
  • Offensive
9.9

Act in a foolish, clumsy way

is senseless but not necessarily emphasizing ineptitude
to act like a dodo
vsto act like a peabrain
  • Offensive
9.3

To behave foolishly and show little common sense

is senseless but not necessarily lacking basic common sense
to be a booby
vsto act like a peabrain
  • Offensive
9.9

Act in a silly or stupid way

is senseless behaviour rather than a character label
to act like a dumbo
vsto act like a peabrain
  • Offensive
9.6

Behave in a silly or foolish way

is senseless conduct rather than outright stupidity label
to act like a dingleberry
vsto act like a peabrain
  • Offensive
9.9

To behave in a silly or annoying way

is senseless foolishness without the irritating quality
to be a chutiya
vsto act like a peabrain
  • Offensive
9.9

To behave in a stupid and rude way

is senseless behaviour without the vulgar slang connotation
to be a clipcock
vsto act like a peabrain
  • Offensive
9.9

Act in a foolish or careless way

is senseless rather than focused on incompetence alone
to act like a scally
vsto act like a peabrain
  • Offensive
9.9

To behave in a silly, rude way and break rules

is senseless without the specific irresponsible or loutish tone

Antonyms

112 2.3

To act with good sense and careful thought

How Foolish

to act like a peabrain
  • Offensive
9.6
to act like a dumbo
  • Offensive
9.6
to be silly
88 2.1

Surface Forms

act like a peabrain infinitive
acted like a peabrain past participle
acting like a peabrain present participle
acts like a peabrain third person singular

Morphology

act + like + a + peabrain

The insult 'peabrain' is a transparent compound of 'pea' (small) + 'brain' (intellect), so 'act like a peabrain' literally means 'behave as if you have a very small brain' = behave foolishly. Despite being informal/slang, the compositional imagery is straightforward and a B1 learner who knows the constituent words should be able to infer the meaning.

Etymology

Act like a peabrain may come from the image of a very small brain — a pea instead of a real brain — so you picture someone who cannot think well. That's why it means 'to behave in a foolish or senseless way'.