Added 9 October 2026 lengthy adjective Categories: Describing WordsUncommon Words adjective ! Definition from WordNet 3.1, Princeton University. More about lengthy at Wordnik → Where our words come from → Relatively long in duration; tediously protracted. a drawn-out argument Related Words: drawn-outprolongedprotractedextendedlonglong-drawnlong-drawn-outelongatedlongtermlongstandingexhaustivelong-time Back to today's word