irrationality

[ih-rash-uh-nal-i-tee]
noun, plural irrationalities for 2.
1.
the quality or condition of being irrational.
2.
an irrational, illogical, or absurd action, thought, etc.

Origin:
1560–70; irrational + -ity

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World English Dictionary
irrationality or irrationalism (ɪˌræʃəˈnælɪtɪ)
 
n
1.  the state or quality of being irrational
2.  irrational thought, action, or behaviour
 
irrationalism or irrationalism
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It leads to irritability, irrationality, and irascibility.
Irrationality plus greed, of course, and a substantial dose of ignorance.
There is nothing that humans' rationality or irrationality can do about it.
Point out the irrationality of my arguments, please.
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