Added 9 October 2026 substantially adverb Categories: Describing WordsEveryday Words adverb ! Definition from WordNet 3.1, Princeton University. More about substantially at Wordnik → Where our words come from → To a great extent or degree. I'm afraid the film was well over budget In a strong substantial way. the house was substantially built Related Words: considerablywellsignificantlyappreciablyconsiderablepredominantlymuchgreatlylargelychieflythoroughlybroadly Back to today's word