fatuousness

• absurdity
• apathy
• asininity
• balminess
• battiness
• brainlessness
• craziness
• cretinism
• daftness
• denseness
• derangement
• dim-wittedness
• dippiness
• doltishness
• dopiness
• dottiness
• dullness
• dulness
• dumbness
• fallacy
• fatuity
• feeble-mindedness
• feeblemindedness
• folly
• foolishness
• gormlessness
• idiocy
• ignorance
• imbecility
• imprudence
• inanity
• incapacity
• ineptitude
• injudiciousness
• insanity
• insensibility
• insipidity
• irrationality
• kookiness
• laughableness
• ludicrousness
• lunacy
• madness
• mindlessness
• nitwittedness
• nonsense
• nonsensicalness
• nuttiness
• oafishness
• obtuseness
• preposterousness
• puerility
• ridiculousness
• senselessness
• shallowness
• silliness
• simplemindedness
• simpleness
• simplicity
• slowness
• sluggishness
• stolidity
• stupefaction
• stupidity
• stupidness
• stupor
• thick-headedness
• tomfoolery
• unreasonableness
• unwisdom
• vacuity
• wackiness
• weak-mindedness
• weakness
• weirdness
• witlessness
• zaniness

• acumen
• brains
• canniness
• discernment
• insight
• intelligence
• judgment
• logicality
• logicalness
• perception
• percipience
• prudence
• rationality
• rationalness
• reasonability
• reasonableness
• sagaciousness
• sagacity
• sageness
• sanity
• sapience
• sense
• sensibleness
• shrewdness
• soundness
• validity
• wisdom

• His constant fatuousness made it hard to take anything he said seriously.
• The comedian exaggerated his fatuousness to entertain the audience.
• She was annoyed by the fatuousness of the conversation at the party.
• The character's fatuousness served as comic relief in the otherwise tense drama.
• Despite his charm, his fatuousness often undermined his credibility.

daftness

oafishness

vacuity

wackiness

zaniness

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