harmful

The definition of harmful is something that causes damage or is able to be hurtful.

(adjective)

A chemical that causes you to become sick is an example of a chemical that would be described as harmful.

See harmful in Webster's New World College Dictionary

adjective

causing or able to cause harm; hurtful

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See harmful in American Heritage Dictionary 4

adjective

Causing or capable of causing harm; injurious.

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