Added 9 October 2026 vastness /ˈvæstnəs/ noun Categories: Describing WordsRare Words In Latin: immānitās Wiktionary noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about vastness at Wordnik → Where our words come from → Unusual largeness in size or extent or number. Related Words: immensenessimmensityenormousnessgrandnessgreatnesssizeablenessgrandeurdepthbroadnessextensivenesscomprehensivenessextension Back to today's word