Added 9 October 2026 indefinable adjective Categories: Describing WordsRare Words adjective ! Definition from WordNet 3.1, Princeton University. More about indefinable at Wordnik → Where our words come from → Not capable of being precisely or readily described; not easily put into words. an indefinable feeling of terror Defying expression or description. indefinable yearnings Related Words: untellableindescribableinexpressibleineffableunexpressibleunutterableunspeakableundefinedundefinablevagueopen-endedindefinite Back to today's word