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harmful

/ˈhɑɹmfl̩/adjective2 syllables

Harmful means: causing or capable of causing harm.

Synonyms for harmful28

adjective, as in causing or capable of causing harm

abusive, bad, bruising, deleterious, hurtful, injurious, calumniatory, calumnious, defamatory, denigrative, denigrating, denigratory, libellous, libelous
and 10 more, slanderous, catastrophic, ruinous, counterproductive, damaging, detrimental, prejudicial, prejudicious, ill, insidious

also used for harmful

inimical, mischievous, nocent, nocuous

Includes material from Wiktionary, CC BY-SA 4.0.

Opposites of harmful

harmless

What does harmful mean?1

adjective

1

causing or capable of causing harm“too much sun is harmful to the skin”

Definitions from the Open English WordNet, CC BY 4.0.

Harmful in a sentence

  • Vaping isn't as harmful as smoking, but it's still addictive and unwise to do.DJ_Saidez
  • That's a very harmful thing to genuinely believe, let alone live by.espamatics
  • Don't touch any unfamiliar plants, they might be harmful!Amastan
  • Littering is harmful to the planet, so let's not do it.Amastan
  • Whenever a new law is not necessary, it is not merely superfluous but harmful.pne
  • Don't feed your parakeet any human food, it can be harmful.Amastan
  • Remember, the well can be harmful, so stay away.Amastan
  • Remember, the fire can be harmful, so be careful.Amastan

Sentences from Tatoeba, CC BY 2.0 FR, credited to their authors.

Forms of harmful

as a adjective

comparative
harmfuller
superlative
harmfullest