Added 10 October 2026 sizeableness noun Categories: Describing WordsObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about sizeableness at Wordnik → Where our words come from → Unusual largeness in size or extent or number. Origin From sizeable + -ness. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: vastnessimmensityimmensenessenormousnessgrandnessgreatnesssizablenesscharacterisabilitybiggishnesspluralisabilitynamablenesssharability Back to today's word