Added 10 October 2026 obsoleteness noun Categories: Describing WordsObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about obsoleteness at Wordnik → Where our words come from → The property of being out of date and not current. Related Words: obsolescencesuperannuationoutdatednessunusednessoutmodednessnonobsolescenceantiquatednessdefunctnessunusefulnessunsufficienceout-of-datenessunsufficiency Back to today's word