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English Wikipedia has an article on:

noxious

Alternative forms

noctious (obsolete)

Etymology

Category:English terms derived from Proto-Indo-European#NOXIOUS Category:English terms derived from the Proto-Indo-European root *neḱ-#NOXIOUS

From Latin Category:English terms derived from Latin#NOXIOUS noxius (“hurtful, injurious”), from noxa (“hurt, injury”), from nocere (“to hurt, injure”); see nocent.

Pronunciation

(Received Pronunciation) IPA^(key): /ˈnɒkʃəs/Category:English 2-syllable words#NOXIOUS Category:English terms with IPA pronunciation#NOXIOUS
(General American) IPA^(key): /ˈnɑkʃəs/Category:English 2-syllable words#NOXIOUS Category:English terms with IPA pronunciation#NOXIOUS
Audio (Southern England): (file)
Category:English terms with audio pronunciation#NOXIOUS

Adjective

noxious (comparative more noxious, superlative most noxious)Category:English lemmas#NOXIOUS Category:English adjectives#NOXIOUS Category:English entries with incorrect language header#NOXIOUS Category:Pages with entries#NOXIOUS Category:Pages with 1 entry#NOXIOUS

Harmful; injurious.
- 1822, John Barclay, chapter I, in An Inquiry Into the Opinions, Ancient and Modern, Concerning Life and Organization‎, Edinburgh; London: Bell & Bradfute; Waugh & Innes; G. & W. B. Whittaker, section I, page 1:
  In the living state, the body is observed to […] reject what is noxious; [...]
  Category:English terms with quotations#NOXIOUS
- 2014 June 14, “It's a gas”, in The Economist‎, volume 411, number 8891, archived from the original on 9 January 2025:
  [...] many old sewers have been neglected and are in dire need of repair. If that repair does not come in time, the result is noxious and potentially hazardous.
  Category:English terms with quotations#NOXIOUS
- 2025 July 9, Mike Isaac, Kate Conger, “X CEO Linda Yaccarino Says She Is Leaving Elon Musk’s Platform”, in The New York Times‎, →ISSN, archived from the original on 9 July 2025:
  Immediately upon joining, Ms. Yaccarino had her work cut out for her. Mr. Musk quickly made changes that tore up much of the good will Twitter had with users, employees and advertisers, including changing speech policies that allowed noxious content to circulate on the platform. Many advertisers left.
  Category:English terms with quotations#NOXIOUS

Synonyms

Derived terms

Related terms

Etymologically related to noxia (“hurt, injury, damage”)

Collocations

with nouns

noxious substance
noxious chemical
noxious fumes
noxious gas
noxious odor
noxious plant
noxious weed
noxious animal
noxious stimulus
noxious stimulation

Translations

harmful — see also mephitic,‎ damaging

Category:Entries with translation boxes#NOXIOUS

Arabic: please add this translation if you canCategory:Requests for translations into Arabic#NOXIOUS
Asturian: nocivu (ast) mCategory:Terms with Asturian translations#NOXIOUS, dañible (ast) m or fCategory:Terms with Asturian translations#NOXIOUS
Basque: kaltegarri (eu)Category:Terms with Basque translations#NOXIOUS
Bulgarian: вреден (bg) (vreden)Category:Terms with Bulgarian translations#NOXIOUS, нездравословен (bg) (nezdravosloven)Category:Terms with Bulgarian translations#NOXIOUS
Catalan: nociu (ca)Category:Terms with Catalan translations#NOXIOUS
Chinese:
Mandarin: please add this translation if you canCategory:Requests for translations into Mandarin#NOXIOUS
Corsican: nucivu mCategory:Terms with Corsican translations#NOXIOUS
Esperanto: venefnaCategory:Terms with Esperanto translations#NOXIOUS
Estonian: kahjur-Category:Terms with Estonian translations#NOXIOUS
Finnish: vahingollinen (fi)Category:Terms with Finnish translations#NOXIOUS, haitallinen (fi)Category:Terms with Finnish translations#NOXIOUS, myrkyllinen (fi)Category:Terms with Finnish translations#NOXIOUS
French: nocif (fr) mCategory:Terms with French translations#NOXIOUS
Friulian: nocîfCategory:Terms with Friulian translations#NOXIOUS
Galician: nocivo (gl) mCategory:Terms with Galician translations#NOXIOUS, daniño (gl) mCategory:Terms with Galician translations#NOXIOUS
German: Schad- (de)Category:Terms with German translations#NOXIOUS, schädlich (de)Category:Terms with German translations#NOXIOUS
Hindi: please add this translation if you canCategory:Requests for translations into Hindi#NOXIOUS
Hungarian: kártékony (hu)Category:Terms with Hungarian translations#NOXIOUS, ártalmas (hu)Category:Terms with Hungarian translations#NOXIOUS
Italian: insalubre (it)Category:Terms with Italian translations#NOXIOUS, nocivo (it)Category:Terms with Italian translations#NOXIOUS, malsano (it)Category:Terms with Italian translations#NOXIOUS
Japanese: 有毒な (ゆうどくな, yūdokuna)Category:Terms with Japanese translations#NOXIOUS
Korean: 유해한 (yuhaehan)Category:Terms with Korean translations#NOXIOUS
Latin: noxius mCategory:Terms with Latin translations#NOXIOUS
Latvian: kaitīgsCategory:Terms with Latvian translations#NOXIOUS
Māori: orotāCategory:Terms with Māori translations#NOXIOUS
Persian: please add this translation if you canCategory:Requests for translations into Persian#NOXIOUS
Polish: szkodliwy (pl)Category:Terms with Polish translations#NOXIOUS, niezdrowy (pl)Category:Terms with Polish translations#NOXIOUS
Portuguese: nocivo (pt) mCategory:Terms with Portuguese translations#NOXIOUS, daninho (pt) mCategory:Terms with Portuguese translations#NOXIOUS
Romanian: nociv (ro) m or nCategory:Terms with Romanian translations#NOXIOUS, vătămător (ro) m or nCategory:Terms with Romanian translations#NOXIOUS, nesănătos (ro) m or nCategory:Terms with Romanian translations#NOXIOUS
Russian: ядови́тый (ru) (jadovítyj)Category:Terms with Russian translations#NOXIOUS, вре́дный (ru) (vrédnyj)Category:Terms with Russian translations#NOXIOUS
Serbo-Croatian:
Cyrillic: ште̏тан mCategory:Terms with Serbo-Croatian translations#NOXIOUS

Latin: štȅtan (sh) mCategory:Terms with Serbo-Croatian translations#NOXIOUS
Spanish: nocivo (es)Category:Terms with Spanish translations#NOXIOUS, nocibleCategory:Terms with Spanish translations#NOXIOUS, nocenteCategory:Terms with Spanish translations#NOXIOUS
Turkish: zararlı (tr)Category:Terms with Turkish translations#NOXIOUS
Vietnamese: độc hại (vi)Category:Terms with Vietnamese translations#NOXIOUS