Added 8 October 2026 longest /ˈlɒŋɡəst/ adverb Categories: Describing WordsUncommon Words adverb ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about longest at Wordnik → Where our words come from → For the most time. she stayed longest Related Words: cheungoldestmostmaximummoregreateradditionbiggestearliestgreatesthighestlargest Back to today's word