Added 9 October 2026 unsound /ˌʌnˈsaʊnd/ adjective Categories: Describing WordsRare Words adjective ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about unsound at Wordnik → Where our words come from → Not sound, particularly: Not whole, not solid, defective. unsound mind Not whole, not solid, defective. unsound mind Infirm, diseased. Related Words: unfitbadinvalidinsecureundependableunreliableunhealthyunstablebroken-downinsaneriskyfallacious Back to today's word