English edit

Etymology edit

From Middle English synfulnes, synfulnesse, synnefulnysse, equivalent to sinful +‎ -ness. Compare Old English synniġness (sinfulness).

Noun edit

sinfulness (countable and uncountable, plural sinfulnesses)

  1. (uncountable) The property of being sinful.
  2. (countable) The result or product of being sinful.