Fatuity (fa-tju-iti) noun: Smug stupidity. Utter foolishness. He showed fatuity as he answered question after question.
origin: first recorded use 1538. Archaic usage denoted imbecility or dementia.
Two different definitions. Similar, but different. I think "utter foolishness" can be forgivable. "Smug stupidity" is just irritating.
Paul told Timothy to, "study to show yourself approved unto God, a workman that need not to be ashamed, rightly dividing the word of truth." No pooling of ignorance or fatuity.
What did the green grape say to the purple grape? "Breathe, breathe."=)