Added 9 October 2026 lengthiness noun Categories: Describing WordsObscure Words noun ! Definition from Wiktionary (CC BY-SA). More about lengthiness at Wordnik → Where our words come from → The property of being lengthy, longness. The lengthiness of his talk bored most of his audience nearly to sleep. Related Words: protractionprolongationextensionlongsomenesslongnessextendednesslong-leggednesselongationlastingnesselongatednesslongitudinalitylong-livedness Back to today's word