Definition of harmful in English:

harmful

Syllabification: harm·ful
Pronunciation: /ˈhärmfəl
 
/

adjective

Causing or likely to cause harm: shield the planet from harmful cosmic rays sugars that can be harmful to the teeth
More example sentences
  • There are alternative fuels, some less harmful to the atmosphere and some which do no harm at all.
  • The Thames has highly dangerous levels of e.coli and other harmful bacteria.
  • CFC gas damages the ozone layer which protects the earth from harmful rays from the sun.
Synonyms
damaging, injurious, detrimental, dangerous, deleterious, unfavorable, negative, disadvantageous, unhealthy, unwholesome, hurtful, baleful, destructive; noxious, hazardous, poisonous, toxic, deadly, lethal; bad, evil, malign, malignant, malevolent, corrupting, subversive, pernicious

Derivatives

harmfully

adverb
More example sentences
  • Even in the worst instances, such as the explosion at a chemical plant in Seveso, Italy in 1976, nobody has ever been exposed to harmfully high doses for prolonged periods.
  • Explanations requiring the supernatural are now not merely quaint but harmfully distracting to children and other innocents.
  • Although in a modern Western diet salt is plentiful - sometimes harmfully superfluous - its normal concentration in the body fluids is essential to the maintenance of a normal blood volume.

harmfulness

noun
More example sentences
  • In the early 20th century the practice of spirit worship, along with a host of other religious practices, was assailed by urban intellectuals for its purported backwardness, ignorance and harmfulness.
  • If some members of a set differ in some important way from the others, usually in terms of their danger or harmfulness, they are put into another group.
  • The present study confirmed the harmfulness of bidis in the causation of lung cancer.

More definitions of harmful

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