The difference between Harmful and Harmless
When used as adjectives, harmful means of a kind likely to be damaging, whereas harmless means incapable of causing harm or danger.
check bellow for the other definitions of Harmful and Harmless
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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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Harmless as an adjective:
Incapable of causing harm or danger; safe.
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Harmless as an adjective:
Not intended to harm; inoffensive.
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Harmless as an adjective (obsolete):
Unharmed.