Definition of "hotheaded"

Such an opportunity can hardly again occur to an ancient and grey-haired man; and to see it lost by the madcap spleen of a hot-headed boy!

1816, Sir Walter Scott, chapter 1, in The Antiquary—Volume II

"But I am!" flashed the young man, as if he had been misunderstood."Listen. You're like all boys—hot-headed an' hasty. Let me talk a little," resumed Anderson.

1919, Zane Grey, chapter 18, in The Desert of Wheat

Hungry for fame and the approval of rare-animal collector Queen Victoria (Imelda Staunton), Darwin deceives the Captain and his crew into believing they can get enough booty to win the pirate competition by entering Polly in a science fair. So the pirates journey to London in cheerful, blinkered defiance of the Queen, a hotheaded schemer whose royal crest reads simply “I hate pirates.”

2012 April 26, Tasha Robinson, “Film: Reviews: The Pirates! Band Of Misfits :”, in The Onion AV Club‎