Noxious vs. Obnoxious — What's the Difference?

Difference Between Noxious and Obnoxious
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Definitions
Noxious
Harmful, poisonous, or very unpleasant
They were overcome by the noxious fumes
Obnoxious
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Noxious
Harmful to living things; injurious to health
Noxious chemical wastes.
Obnoxious
Extremely unpleasant
He found her son somewhat obnoxious
Obnoxious odours
Noxious
Harmful to the mind or morals; corrupting
Noxious ideas.
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Obnoxious
Very annoying or objectionable; offensive or odious
"I know no method to secure the repeal of bad or obnoxious laws so effective as their stringent execution" (Ulysses S. Grant).
Noxious
Harmful; injurious.
Obnoxious
(Archaic) Exposed or subject to harm, injury, or evil
"Those who are most obnoxious to punishment will flee from the country" (George Washington).
Noxious
Hurtful; harmful; baneful; pernicious; injurious; destructive; unwholesome; insalubrious; as, noxious air, food, or climate; pernicious; corrupting to morals; as, noxious practices or examples.
Too frequent an appearance in places of public resort is noxious to spiritual promotions.
Obnoxious
(Archaic) Deserving of or liable to censure.
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Noxious
Guilty; criminal.
Those who are noxious in the eye of the law.
Obnoxious
Extremely offensive or unpleasant; very annoying, contemptible, or odious.
He was an especially obnoxious and detestable specimen of a man.
Throwing stones at the bus is another example of your obnoxious behaviour.
Noxious
Injurious to physical or mental health;
Noxious chemical wastes
Noxious ideas
Obnoxious
Exposed or vulnerable to something, especially harm or injury.
Obnoxious
(obsolete)
Obnoxious
Causing harm or injury; harmful, hurtful, injurious.
Obnoxious
Deserving of blame or punishment; blameworthy, guilty.
Obnoxious
Under the authority or power of someone; subject, subordinate; hence, deferential, submissive, subservient.
Obnoxious
Followed by to: likely to do something.
Obnoxious
Subject; liable; exposed; answerable; amenable; - with to.
The writings of lawyers, which are tied obnoxious to their particular laws.
Esteeming it more honorable to live on the public than to be obnoxious to any private purse.
Obnoxious, first or last,To basest things
Obnoxious
Liable to censure; exposed to punishment; reprehensible; blameworthy.
All are obnoxious, and this faulty land,Like fainting Hester, does before you standWatching your scepter.
Obnoxious
Very offensive; odious; hateful; as, an obnoxious statesman; a minister obnoxious to the Whigs.
Obnoxious
Causing disapproval or protest;
A vulgar and objectionable person