Added 10 October 2026 nontoxic adjective Categories: Describing WordsRare Words adjective ! Definition from Wiktionary (CC BY-SA). More about nontoxic at Wordnik → Where our words come from → Not toxic; not poisonous. noun A substance that is not toxic. Related Words: nonpoisonousnonvenomousharmlessedibleeatablecomestibleatoxicantitoxicnon-toxicmixingprodrugpoisonous Back to today's word