The word "prideful" is correct and usable in written English.
You can use it when you want to express a feeling of being full of pride for something or someone, especially when it goes too far or is excessive. Example sentence: His prideful attitude towards his achievements prevented him from seeking help with his project.
An elaborate plan to patch up the quarrel collapsed when Mr Netanyahu's prideful coalition partners refused to let him go beyond expressing regret and offer a formal apology.
In the small community of poor Pashtun farmers who inhabit Qala-e Naw, Gulali was well liked for her prideful and precocious work ethic, and true to form, when her mother said they had enough wood and it was time to go home, Gulali insisted on felling one last tree.
The country, McCain said, is now "a world away from the cruel and prideful bigotry of that time".
Had prideful buttocks ever played such a dominant role before in a religious painting?
And this is a part of Baselitz's response, this eagle, reprised many times, over a period of more than half a century, that mighty, prideful bird with a ferocious, attent eye, magnificent, doomed raptor, symbol of a botched civilisation, ever falling towards the abyss.
"We are a prideful human species and we have been documenting our hunts for the last 75,000 years in petroglyphs and not in photographs.
"I'm a much better person when I'm working on a film because I'm really committed to myself, not in a vain, prideful way, but actually being myself because I feel that film is a graphic representation of my state, whatever my state is, what I am as a person".
There was laughter at the prideful reprimands of a bejewelled King George, and delighted recognition of the Biggie homage in "Duel Commandments".
Khan and his wife, a Dutch-South African, could be warm and generous to friends and colleagues, according to Griffin, but Khan could also be prideful and quick to comment on other people's shortcomings.
(The alternative being, after an embarrassingly prideful assessment, not doing that).
Yet Pakistan's prideful insistence on its sovereignty means, among other things, that the United States cannot provide relief directly to internally displaced civilians.
