If someone is hotheaded, they do things too quickly, often because they are angry or excited, and they do not stop to think. It describes the person or their actions (a hotheaded reply, a hotheaded driver). It is the adjective that sits beside the noun hothead. Informal, a little critical. It is not the same as brave, and not the same as lively. A calm plan made too fast is rash; a hotheaded one has heat in it — feeling pushing the person forward. Though actually, people sometimes call themselves hotheaded as a half-excuse, as if the temper is just how they are.