Meanings
plural brainiacs
- derogatoryslangsometimesA very intelligent and usually studious, erudite person.
With all the brainiacs in the world ... you'd think somebody would come up with a sunblock for ice cream.
2009 July 18, Tom Armstrong, Marvin (comic)1 more example
With nearly 900,000 Twitter followers, Popova is a member of a rare pantheon of “influencers” for the brainiac crowd. Miraculously, she makes a living writing a blog about science, literature, philosophy, feminism and whatever else takes her voracious and generous fancy.
2019 February 8, Margaret Wertheim, “Minds that explore the beauty of math and the logic of art”, in Washington Post, →ISSNSynonyms: genius, pedant, smart-ass, wiseguy · Antonyms: dufus, dumb-ass, dumbo, idiot, ignoramus
Synonyms & antonyms
nounA very intelligent and usually studious, erudite person.
More synonyms by meaning
nounsomeone who has exceptional intellectual ability and originality
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
Blend of brain + maniac, with influence from ENIAC, the name of an early computer. The term was coined as the name of the fictional supervillain Brainiac in the Superman series and first appeared in Action Comics comic book #242 in July, 1958. By surface analysis, brainy + -ac.
Full word history & related roots →Translations
Finnish nero
- neroa very intelligent and usually studious, erudite person
French grosse tête
- grosse têtea very intelligent and usually studious, erudite person
German Intelligenzbestie
- Intelligenzbestiea very intelligent and usually studious, erudite person
Italian cervellone
- cervellonea very intelligent and usually studious, erudite person
Polish mózgowiec
- mózgowieca very intelligent and usually studious, erudite person
Spanish cerebrito, pitagorín
- cerebritoa very intelligent and usually studious, erudite person
- pitagorína very intelligent and usually studious, erudite person
- cerebrína very intelligent and usually studious, erudite person
- lumbreraa very intelligent and usually studious, erudite person
- luminariaa very intelligent and usually studious, erudite person
Rhymes & wordplay
Rhymes with brainiac
Anagrams
Cite this entry
brainiac. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/brainiac
“brainiac.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/brainiac. Accessed November 2, 2026.
WatkinsX Dictionary, s.v. “brainiac,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/brainiac.
Source: brainiac on Wiktionary, CC BY-SA 4.0.