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• s  (used colloquially) overly conceited or arrogant

• Achmed, a bigheaded Halloween skeleton, is a failed suicide bomber.
• But they very plainly keep children from becoming as broad and deep-chested and as bigheaded as they should be.
• While Japan's idoru, or mass-produced pop stars, often seem as generic as machines, the country's animated characters, like Doraemon, have the bigheaded individuality of real rebels.

• persnickety
• snooty
• snot-nosed
• snotty
• stuck-up
• too big for one's breeches
• uppish

Quotes

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• Jenson Button in Glasgow Daily Record
  Button said: "Those laps were the best I've ever done. At the end of the first I was seventh and then I caught Mark Webber and was closing in on the world champ. I'm going to be bigheaded and say I've not seen anything like it. Ayrton Senna came...
• Devin Vargas in USA Today
  I kind of went in there bigheaded,Vargas said. "I haven't fought anyone with that (style) since I was maybe 15. I should have stayed in the middle of the ring and just let him come to me."