fatuity

The affair had gone so smoothly that Ryanne's usual keenness fell below the mark; fatuity was the word.

They rise to Alpine heights of pure wisdom and power, leaving him to flounder ignobly in the mire of his own fatuity.

One feature of the message would have convinced the Tyro, had he seen it, of the fatuity of fatherhood.

Their conduct to those who did not understand this, resembled insanity or fatuity more than anything else.