harmfully

IPA/ˈhɑːmfəli/
KK[hˈɑrmfəli]IPA/ˈhɑːrmfəli/

harmfully — adverb

1. in a manner that causes damage, injury, or a bad effect on a person, an animal,

1.adverbB2
Definition

in a manner that causes damage, injury, or a bad effect on a person, an animal, or the natural world.

Example

Plastic bags wash into the river and harmfully affect the fish living there.

verb + harmfully: typical environmental harm context

Andrés warned that staring at the eclipse without glasses would harmfully damage his eyes.

harmfully + damage: collocation with physical injury verbs

Common collocations
  • harmfully affect
  • harmfully impact
  • act harmfully on
  • harmfully discharged
  • more harmfully than
Synonyms
  • damagingly

    near-equivalent; slightly more formal; often about reputations or systems

  • detrimentally

    more formal; common in academic and policy writing

  • injuriously

    rare and formal; mostly legal or medical writing

Antonyms

Grammar Patterns

verb + harmfully

harmfully + past participle

Usage Note

Modifies action verbs that already imply impact (affect, damage, act, influence). Often appears in scientific, medical, or environmental writing rather than everyday speech; in casual contexts, speakers usually say 'in a harmful way' or rephrase with the adjective 'harmful'.

Common Mistakes

The chemical is harmfully.
The chemical is harmful.
use the adjective 'harmful' after the verb 'be', not the adverb.
Smoking harmfully your lungs.
Smoking harms your lungs.' or 'Smoking harmfully affects your lungs.
'harmfully' modifies a verb; it cannot replace one.

Word family

Synonym discussion

Sense: adverb/1

All four adverbs describe an action that causes a bad effect, but they differ in register and typical context. 'Harmfully' is the most general and is common in health, environment, and safety writing — 'the chemical acts harmfully on the skin'. 'Damagingly' is slightly more formal and often points to harm done to reputations, relationships, or systems rather than living bodies — 'the report spoke damagingly of the minister'. 'Detrimentally' belongs to academic, legal, and policy registers and stresses a measurable negative outcome — 'late nights detrimentally affected her grades'. 'Injuriously' is rare and formal, mostly found in legal documents or older medical texts about bodily harm — 'the device must not be used injuriously'. For everyday writing, 'harmfully' or 'in a harmful way' is almost always the natural choice.

harmfully ↗damagingly ↗detrimentally ↗injuriously ↗

Common collocations

Adverbs

  • more harmfully
  • potentially harmfully
  • seriously harmfully

Phrases

  • harmfully affect
  • harmfully impact
  • act harmfully on

Prepositions

  • harmfully on
  • harmfully to

Etymology

Old EnglishMiddle EnglishEnglish

Built inside English from the adjective 'harmful' (recorded from the 14th century) plus the regular adverb ending '-ly'. The noun 'harm' itself comes from Old English 'hearm', meaning hurt, evil, or grief, with cousins across the older Germanic languages. The adverb form 'harmfully' became more common from the 17th century onward as English writers needed a tidy single-word way to say 'in a harmful manner'.