English

Noun

rationalness ‎(uncountable)

1. (archaic) The quality or state of being rational.
   • 1861 Aug. 31, "The New Papacy" The Nation, vol. 13, no. 322, p. 142 (retrieved 5 Dec 2011):

     And what difference is there between the credibleness and rationalness of any of these wonders and the credibleness and rationalness of Papal infallibility?

Synonyms

• rationality

References

• rationalness at OneLook Dictionary Search