Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
Keep scrolling for more
balmy, barmy [chiefly British], bats, batty, bedlam, brainsick, bughouse [slang], certifiable, crackbrained, cracked, crackers, crackpot, cranky [dialect], crazed, crazy, cuckoo, daffy, daft, demented, deranged, fruity [slang], gaga, haywire, insane, kooky (also kookie), loco [slang], loony (also looney), loony tunes (or looney tunes), lunatic, mad, maniacal (also maniac), mental, meshuga (or meshugge), moonstruck, non compos mentis, nuts, nutty, psycho, psychotic, scatty [chiefly British], screwy, unbalanced, unhinged, unsound, wacko (also whacko), wacky (also whacky), wud [chiefly Scottish]
balanced, compos mentis, sane, sound, uncrazy
Recent Examples on the Web
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'bonkers.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
1945, in the meaning defined above
perhaps from bonk + -ers (as in crackers)
Resources for bonkers
Time Traveler for bonkers
See more words from the same year
More from Merriam-Webster on bonkers
Thesaurus: All synonyms and antonyms for bonkers
Comments on bonkers
What made you want to look up bonkers? Please tell us where you read or heard it (including the quote, if possible).
to deny responsibility for
Get Word of the Day daily email!
What did you just call me?! A Quiz
Test your vocabulary with our 10-question quiz!
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
It relates to godfathers.
Nothing to see here.
Words from the week of 2/15/2019
Is 'orientate' a real word?
Comedian ISMO on what separates a boot from a trunk
Comedian ISMO on the complexities of the word 'tip'
How to use a word that (literally) drives some people nuts.
The awkward case of 'his or her'
Never be caught off guard
A quiz for lovers and haters
SCRABBLE® fans, sharpen your skills!