Added 9 October 2026 countless /ˈkaʊntləs/ adjective Categories: Describing WordsUncommon Words adjective ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about countless at Wordnik → Where our words come from → Too numerous to be counted. countless hours Related Words: unnumerableinnumerousnumberlessinnumerableunnumberablemultitudinousinfinitemyriadincalculableunnumbereduncountednumerous Back to today's word