Irresponsibility is a related term of fatuousness.
As nouns the difference between irresponsibility and fatuousness
is that irresponsibility is the character or state of being irresponsible; lack of or freedom from responsibility; want of accountability while fatuousness is the characteristic of being fatuous.
irresponsibility
English
Noun
The character or state of being irresponsible; lack of or freedom from responsibility; want of accountability.
References
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fatuousness
English
Noun
(en-noun)
The characteristic of being fatuous.