Added 10 October 2026 adeptness noun Categories: Mind & IdeasObscure Words noun ! Definition from Wiktionary (CC BY-SA). More about adeptness at Wordnik → Where our words come from → The quality of being adept. Related Words: adroitnessdeftnessfacilityquicknessskillfulnessinadeptnessaptitudeadaptnessprowessavidnessadaptabilityexpertness Back to today's word