seldomness

From seldom +‎ -ness.

seldomness (uncountable)

1. Rareness; infrequency; uncommonness.
   • 1594–1597, Richard Hooker, edited by J[ohn] S[penser], Of the Lawes of Ecclesiastical Politie, […], London: […] Will[iam] Stansby [for Matthew Lownes], published 1611, →OCLC, (please specify the page):

     the seldomness and oftenness of doing well

• rarity; see also Thesaurus:rareness

“seldomness”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.