nocuous C2+ Topic:Describing Qualities US /ˈnɑkjuəs/ UK /ˈnɒkjuəs/ See IPA manual Meanings 1 adj harmful, noxious, or poisonous The factory released a nocuous vapor that sickened nearby residents. Thesaurus Synonyms 1 adj · harmful, noxious, or poisonous harmfulnoxiousinjuriouspoisonoustoxichurtful ↔ Opposites innocuousharmlessbenign Word family Related forms innocuousnocentnuisance Etymology AI details From Latin nocuus ('harmful'), from nocere ('to harm, injure'). nocuus Latin nocere Latin View etymology graph -> Topics Describing Qualities Word Formation & Derivatives External links Google Images Cambridge Dictionary Wiktionary # nocuous **Type:** Word **Level:** C2+ **Part of speech:** adj **IPA (US):** /ˈnɑkjuəs/ **IPA (UK):** /ˈnɒkjuəs/ ## Meanings 1. harmful, noxious, or poisonous ## Examples - The factory released a nocuous vapor that sickened nearby residents. ## Synonyms - harmful - noxious - injurious - poisonous - toxic - hurtful ## Antonyms - innocuous - harmless - benign ## Related Forms - innocuous - nocent - nuisance ## Roots and Affixes - Root: nocuus - Root: nocere ## Etymology From Latin nocuus ('harmful'), from nocere ('to harm, injure'). ## AI Etymology Nocuous comes from Latin nocuus ('harmful'), from nocere ('to harm, injure'). The form is best read as a historical transfer or inheritance, with its older language material carrying the main semantic load. As an adjective, it carries the sense "harmful, noxious, or poisonous", with the older formation still helping explain the modern use. Relevant historical forms include Latin nocuus and Latin nocere. Related words include innocuous, nocent, nuisance. ## Topics - Describing Qualities - Word Formation & Derivatives markdown