as in flibbertigibbets
a silly flighty person
in a medical situation of this seriousness we don't need some rattlebrain running around in a panic
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
Example Sentences
Recent Examples of Synonyms for rattlebrains
Noun
-
The mind wants desperately to connect with a person—and fools itself into seeing one in a machine.—
Damon Beres,
The Atlantic,
5 Nov. 2025 -
None of this is meant to suggest that a trade is imminent, but if offered the chance to trade these three players for Peralta, the Yankees would be fools not to take it.—
Jackson Roberts,
MSNBC Newsweek,
20 Oct. 2025
Noun
-
The honks of wild Canada geese, for instance, fresh out of the Arctic and now high in the clouds going south, signal a change in seasons for me.—
Literary Hub,
Literary Hub,
4 Nov. 2025
-
The farm is home to goats, Holstein cows, potbellied and kune kune pigs, donkeys, sheep, rabbits, llamas, alpacas, guinea fowl, guinea pigs, geese, chickens, a Shetland pony, and a Shire horse.—
Rachel Raposas,
PEOPLE,
23 Oct. 2025
Noun
-
Brood parasites such as cuckoos lay their eggs in other birds’ nests, tricking the hosts into caring for their offspring at the expense of their own.—
Matthew Martin,
semafor.com,
6 Oct. 2025
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.
Cite this Entry
“Rattlebrains.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/rattlebrains. Accessed 15 Nov. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share