CRACKBRAIN Synonyms: 41 Similar and Opposite Words

crackbrain

noun

ˈkrak-ˌbrān

Definition of crackbrain

as in eccentric

a person of odd or whimsical habits a crackbrain who wore bedroom slippers to the grocery shop

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

Example Sentences

Recent Examples of Synonyms for crackbrain

Noun

The public reckonings with these figures’ legacies—the troubled former child star gone too soon, the beloved icon, the cult favorite, the complicated eccentric—have come in a cascade.

— Michael Schulman, New Yorker, 5 Sep. 2026
Make sure to practice a full range of motion with these and emphasize the eccentric (the way down) part of the movement for maximal time under tension and muscle-building stimulus.

— Jakob Roze, HEALTH, 19 Aug. 2026

Definition of eccentric

Noun

Given how Wade is defined by his love of hallucinogenic mushrooms and off-roading in an ATV, the character is designed to be played big, and Heaton appears to be enjoying himself.

— Daniel Fienberg, HollywoodReporter, 8 Oct. 2026
Brooklyn Nine-Nine alum Fumero’s character, Teri, is a detective inspector for the New Jersey State Police.

— Jesse Whittock, Deadline, 8 Oct. 2026

Definition of character

Noun

My question is, with what AB did to the Raiders, Why would Gruden/Mayock want to take another head case like Jalen Ramsey?

— Jerry McDonald, The Mercury News, 20 Sep. 2019
Whiteside has a reputation of being a bit of a head case, and also, in need of motivation.

— oregonlive.com, oregonlive.com, 1 July 2019

Definition of head case

Noun

While Annie seemed like the odd duck out, her closest, idol-holding ally Alex seemed to be considering Sophi as his target, with the goal of taking out his bromance Jake’s other bestie.

— Nick Caruso, TVLine, 2 Oct. 2025
The Incredible Hulk' (2008) Before ultimately being replaced in other movies by Mark Ruffalo, Edward Norton starred as scientist Bruce Banner in this odd duck from the nascent MCU.

— Brian Truitt, USA Today, 25 July 2025

Definition of odd duck

Noun

Shelf-stable picks that need no fridge include trail mix, applesauce cups, peanut butter with rice cakes, nuts and veggie chips.

— Lauren Schuster, Miami Herald, 5 Oct. 2026
Shelf-stable picks that need no fridge include trail mix, applesauce cups, peanut butter and rice cakes, nuts and veggie chips.

— Lauren Schuster, Fort Worth Star-Telegram, 5 Oct. 2026

Definition of nut

Noun

Many spent their days suspended from steel cables, raised and lowered along the mountainside by hand cranks.

— Encyclopedia Britannica, Encyclopedia Britannica, 29 Sep. 2026
The engine features a flat-plane crank that Mercedes-Benz AMG said reduces rotating mass and improves revving characteristics.

— Joel Feder, The Drive, 10 Sep. 2026

Definition of crank

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Browse Nearby Words

crack

crackbrain

crackbrained

See all Nearby Words

Cite this Entry

Style

“Crackbrain.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/crackbrain. Accessed 8 Oct. 2026.

Copy Citation

Synonyms of crackbrain

noun

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

etiquette

Popular in Grammar & Usage

Do You Need a New Language Peeve?

The Exceptions of '-s' and '-es' Plurals

Merriam-Webster’s Great Big List of Words You Love to Hate

Is it 'nerve-racking' or 'nerve-wracking'?

What's the difference between 'fascism' and 'socialism'?

Popular in Wordplay

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't

7 Words for Bad Endings and Rough Situations

Even More Bird Names that Sound Like Insults (and Sometimes Are)

12 Lovely and Unusual Words for the Natural World

Popular

Do You Need a New Language Peeve?

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't

Games & Quizzes