Added 9 October 2026 concaveness noun Categories: Describing WordsObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about concaveness at Wordnik → Where our words come from → The property possessed by a concave shape. Related Words: concavityconcavo-convexityconvexednessquasiconcavityconvexitybiconcavityconvexnessdishpseudoconcavityconicalnesssubconvexitybiconvexity Back to today's word