invariableness

From invariable +‎ -ness.

invariableness (uncountable)

1. invariability; the state of being invariable

   Synonyms: immutability, unchangeableness

• William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “invariableness”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.
• “invariable”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.