Exaggerated pride or self-confidence.
[Origin: Greek, possibly a back-formation from hubristic or else from Greek hybris “wanton violence, insolence, outrage,” originally “presumption toward the gods”.]
“There was a pertness to my tone that I regretted the moment it was out of my mouth for, to my ear, it spoke far too plainly of my intent. It was fortunate for me that the hubris of prideful men swells about them like a rising sea and fills their ears with nothing but the roaring of the ovations that await them. I might have told the apothecary every detail of the plot then, I think, and he would have heard nothing. If he had observed the opening and closing of my lips, doubtless he would have taken it for applause.” – The Nature of Monsters, Clare Clark.