The quality of being convenient, useful, or easy to use; or the skill in using your hands.
From 'handy' plus the noun suffix '-ness' (Old English '-nes'), which creates abstract nouns describing a state or quality of being.
We added '-ness' to 'handy' because English speakers wanted to talk about convenience as an abstract idea, not just a thing—this shows how our language lets us transform concrete skills (using hands) into abstract concepts (convenience).
Complete word intelligence in one call. Free tier — 50 lookups/day.