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"More harmful" and "most harmful." We would not use the -er and -est suffixes on the -ful which is already a suffix.

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Wiki User

8y ago
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Wiki User

11y ago

"harmful" doesn't have a comparative and superlative form. Instead, you would say "more harmful" or "most harmful."

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XALIIMO FANDHE

Lvl 1
2y ago
i do now this answer please help.!?

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Wiki User

8y ago

It is more dangerous and then most dangerous.

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Wiki User

7y ago

more harmful

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Wiki User

7y ago

more dangerous

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Wiki User

8y ago

more dangerous

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Wiki User

8y ago

More harmful and most harmful

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Wiki User

7y ago

unhealthier

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Q: What is the comparative and superlative of harmful?
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