Having the psychological condition of egomania.(adjective)
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Use "egomaniacal" in a sentence
"Steinberg portrayed Chicago's Black community as "egomaniacal" with failed leadership."
"Which may sound kind of egomaniacal, but in fact it is what you'd expect a writer to say -- whether it's a good script or a bad script, a good show or a bad show, writers are naturally protective of what they've written."
"Occasionally I’ll take a hit from a critic for being somehow arrogant or egomaniacal, which is difficult to understand from my point of view sitting here and just trying to write about whatever I find interesting."