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Definitions

mad as a hatter

ADJECTIVE
bananas
Synonyms
STRONG
crackers crazy cuckoo lunatic maniac nuts psycho sick
WEAK
bonkers brainsick crazy as a loon daft demented deranged distraught disturbed dotty kooky loco mad maniacal moonstruck not all there nutty as a fruitcake off one's rocker out of one's mind out to lunch sick in the head stark raving mad touched unbalanced unhinged unsound wacky
Antonyms
STRONG
healthy sane sensible
ADJECTIVE
brainsick
Synonyms
WEAK
batty bonkers cracked crackers crazed crazy daft demented disordered distraught dotty lunatic mad maniac maniacal moonstruck not all there nuts nutty off one's rocker out of one's mind psychotic sick in the head stark raving mad touched unbalanced unhinged unsound
ADJECTIVE
crazy
Synonyms
STRONGEST
insane kooky mad nuts nutty silly wacky
STRONG
ape berserk cuckoo lunatic potty psycho screwball
WEAK
barmy bats in the belfry batty bonkers cracked crazed daft delirious demented deranged dingy dippy erratic flaky flipped flipped-out freaked-out fruity idiotic mad as a March hare maniacal mental moonstruck nutty as fruitcake of unsound mind out of one's mind out of one's tree out to lunch round the bend screw loose screwy touched unbalanced unglued unhinged unzipped
Antonyms
STRONGEST
balanced calm collected rational reasonable sane sound
WEAK
realistic responsible sensible
ADJECTIVE
fruity
Synonyms
STRONGEST
nutty
WEAK
bananas batty bonkers buggy crackers crazed crazy crazy as a loon cuckoo daft demented disordered dotty eccentric kooky loco loony lunatic mad moonstruck not all there nuts nutty as a fruitcake of unsound mind off off one's rocker out of one's mind stark raving mad touched unbalanced unsound wacky
ADJECTIVE
loco
Synonyms
WEAK
around the bend batty bizarre brainsick cracked crazed crazy crazy as a loon cuckoo daft demented deranged disordered distraught dotty fatuous frenzied idiotic impractical irrational irresponsible loony lunatic mad maniac maniacal moonstruck not all there nuts nutty nutty as a fruitcake of unsound mind off off one's rocker out of one's mind paranoid preposterous psychopathic psychotic rabid raging raving screwy senseless sick in the head stark raving mad touched unbalanced unhinged unsettled unsound wild wrong
ADJECTIVE
moonstruck
Synonyms
WEAK
around the bend batty bizarre brainsick cracked crazed crazy crazy as a loon cuckoo daft demented deranged disordered distraught dotty fatuous frenzied idiotic impractical irrational irresponsible loony lunatic mad maniac maniacal not all there nuts nutty nutty as a fruitcake of unsound mind off off one's rocker out of one's mind paranoid preposterous psychopathic psychotic rabid raging raving screwy senseless sick in the head stark raving mad touched unbalanced unhinged unsettled unsound wild wrong

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It doesn’t take long for Onion to realize that Brown, for all his noble ambitions of emancipation, is as mad as a hatter.

From Los Angeles Times • Jun. 23, 2021

Simply mad as a hatter how brief the wait was for this glow-in-the-dark classic.

From Los Angeles Times • Jun. 1, 2021

During various episodes in his life, Lowell was as mad as a hatter, but in poems like these he went crazy for a purpose.

From The Guardian • Sep. 26, 2020

Because part of the illusion we were creating was that he was mad as a hatter.

From Washington Times • Dec. 28, 2014

The cap’n’s knowed to be mad as a hatter, but even someone crazy as him has to know all Pap’s business here on earth is through.

From "The Journey of Little Charlie" by Christopher Paul Curtis