fatuity

I might add that at last they become terrible, and disgust every one by their fatuity and nonsense.

With a fatuity hardly more credible than creditable, the Lalugwumps, as they call themselves, deny the immortality of the soul.

Troy remembered her dissertations on the steamer, and winced at a fresh display of such fatuity in such a scene.

With singular fatuity none of the officers or seamen were armed, although the ship was well provided with weapons.

"Oh, you needn't fear; you shan't lose me," the girl replied with charming gross fatuity.