Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “harmful”

harmful

adjective     /ˈhɑːm.fəl/ US  /ˈhɑːrm-/
B2 causing harm: This group of chemicals is known to be harmful to people with asthma.Dangerous and harmful harmfully     /-i/ adverb Dangerous and harmful harmfulness     /-nəs/ noun [U]
(Definition of harmful adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of harmful

Definitions of “harmful” in other dictionaries

Word of the Day

exercise

physical activity that you do to make your body strong and healthy

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More