noxious

adjective nox·ious \ ˈnäk-shəs \
Updated on: 7 Dec 2017

Definition of noxious

1 a : physically harmful or destructive to living beings
  • noxious waste
  • noxious fumes
b : constituting a harmful influence on mind or behavior; especially : morally corrupting
  • noxious doctrines
2 : disagreeable, obnoxious
  • this noxious political scandal
  • —H. L. Ickes

noxiously

adverb

noxiousness

noun

Examples of noxious in a Sentence

  1. mixing bleach and ammonia can cause noxious fumes that can seriously harm you

  2. noxious smog that for years has been encrusting the historic cathedral with soot

Recent Examples of noxious from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'noxious.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of noxious

Middle English noxius, from Latin, from noxa harm; akin to Latin nocēre to harm, nec-, nex violent death, Greek nekros dead body

Synonym Discussion of noxious

pernicious, baneful, noxious, deleterious, detrimental mean exceedingly harmful. pernicious implies irreparable harm done through evil or insidious corrupting or undermining.
    • the claim that pornography has a pernicious effect on society
baneful implies injury through poisoning or destroying.
    • the baneful notion that discipline destroys creativity
noxious applies to what is both offensive and injurious to the health of a body or mind.
    • noxious chemical fumes
deleterious applies to what has an often unsuspected harmful effect.
    • a diet found to have deleterious effects
detrimental implies obvious harmfulness to something specified.
    • the detrimental effects of excessive drinking

NOXIOUS Defined for English Language Learners

noxious

adjective

Definition of noxious for English Language Learners

  • : harmful to living things


NOXIOUS Defined for Kids

noxious

adjective nox·ious \ ˈnäk-shəs \

Definition of noxious for Students

: causing harm
  • noxious fumes

Medical Dictionary

noxious

adjective nox·ious \ ˈnäk-shəs \

medical Definition of noxious

: physically harmful or destructive to living beings
  • noxious wastes


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