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