The meaning of HARMFUL is of a kind likely to be damaging : injurious. How to use harmful in a sentence.

You do not suppress free speech; you eliminate harmful opinions, obscenity and corruption.

Definition of harmful adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

harm•ful /ˈhɑrmfəl/ adj. causing or capable of causing harm. harm•ful•ly, adv. harm•ful•ness, n. [uncountable] WordReference Random House Unabridged Dictionary of American English © …

Something that is harmful has a bad effect on something else, especially on a person's health. ...the harmful effects of smoking.

harmful If something is harmful to someone or harmful for them, it has a bad effect on them. Too much salt can be harmful to a young baby. Potassium could be harmful for those with impaired …

Oct 8, 2025 · Causing or likely to cause harm or damage; injurious. Wear a hat to protect your skin from harmful sunlight. Smoking is harmful to the lungs. Burning fossil fuels is harmful to …

HARMFUL definition: causing or capable of causing harm; injurious. See examples of harmful used in a sentence.

Definition of harmful. English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels.

Harmful is an adjective that comes in handy when you're talking about things that cause injury to someone or damage something. Burning coal can be harmful to the environment, and eating …