reasonability or reasonableness

[Unomyname]

hi, i am trying to grasp the subtle difference between the nouns that may be formed around “reasonable”.

I am looking for the one that would reflect “state of being reasonable”. I feel it will be “reasonableness”.

Is “reasonability” ability to be reasonable then?

[Mister_Micawber]

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Either will serve, but I think that ‘reasonableness’ is more usual nowadays.
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[Unomyname]

thanks