The difference between Harmful and Noxious
When used as adjectives, harmful means of a kind likely to be damaging, whereas noxious means harmful.
check bellow for the other definitions of Harmful and Noxious
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Harmful as an adjective:
of a kind likely to be damaging; injurious
Examples:
"Wear a hat to protect your skin from harmful sunlight."
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Noxious as an adjective:
Harmful; injurious.