English edit

Etymology edit

From convincing +‎ -ness.

Noun edit

convincingness (uncountable)

  1. The state or quality of being convincing.
    Synonym: persuasiveness
    • 1931, H. P. Lovecraft, chapter 4, in The Whisperer in Darkness:
      The substance of the note was wholly insane, yet the manner of expression—in view of all that had gone before—had a grimly potent quality of convincingness.

Further reading edit