Added 10 October 2026 masterfulness noun Categories: Obscure Words noun ! Definition from Wiktionary (CC BY-SA). More about masterfulness at Wordnik → Where our words come from → The quality of being masterful. Related Words: masterlinessmagisterymasterymagisterialnessmajesticalnesspowerfulnessschoolmasterishnessmagisterialitymajesticnessself-masteryexpertnessdomineeringness Back to today's word