Definition of Harmful

likely to injure or cause harm

Examples of Harmful in a sentence

Harmful chemicals succeeded in killing the pests but they also contaminated our water system.  🔊

Although it doesn’t look very harmful, the small insect has a poisonous sting.  🔊

Steps must be taken to stop harmful pollution from hurting our ozone layer.  🔊

Sunblock can aid in protecting your skin from harmful rays while you enjoy the beach.  🔊

Although he knows smoking is harmful to his body, my father will not quit using dangerous tobacco products.  🔊

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