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.

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 …

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

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

Collins Concise English Dictionary © HarperCollins Publishers:: harmful /ˈhɑːmfʊl/ adj causing or tending to cause harm; injurious ˈharmfully adv ' harmful ' also found in these entries (note: …

Dec 14, 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 …

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

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

Jan 11, 2016 · 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 …