Smoking may be harmful to his heart.
Source: tatoeba (19934)
Harmful
/ˈhɑːmfl̩/
Synonyms for "harmful" (197 found)
Ranked by relevance and common usage.
Closest matches (40)
abusiveadverseantagonisticbadbad forbalefulbanefulbitchyconflictingcontaminatedcontrarycorrodingcorrosivecorruptingcorruptivecountercounteractivecounterproductivecusseddamaging
Show 3 more words
Adjective(13 words)
abusive conductabusive languageadverse outcomeadverse weather impactbad examplebad intentionbiological disruptioncalumniouscancerouscorrosive chemicaldamagingdeadlierdegradative methods
Noun(4 words)
Strong matches (59)
Noun(8 words)
Verb(4 words)
Adjective(12 words)
detractivedetrimentaldetrimental influenceenvironmental harmsevilesthazardous acidhazardous chemicalhazardous choicehazardous misuseimmoral agentinjuriouslanguage-impeding
Adjective(1 words)
Related words (98)
morbificnastynoisomenot easynoxiousominousopposedopposingoppositeornerypathogenicpeccantperniciouspestiferouspoisonouspollutedprejudicialrigorousriskyruinous
Show 33 more words
Noun(16 words)
Adjective(29 words)
nastiernegative imprintnegative influencenegative numbernegative-affectingnegative-impact eventnegative-impact studypathogenic bacilluspathogenic bacteriumpathogenic microbepathogenic organismpestilentpoisonous mushroomsanioussevere reputation damagetoxic chemicaltoxic environmenttoxic materialtoxic rumortoxic solvent
Show 9 more words
toxic substanceundesirableunfavorable conditionunhealthierunhealthy conditionunsafeunsustainable farmingviolent actvirulent microbe
Choosing the right synonym
- Closest matches in this entry: abusive, abusive conduct, abusive language, adverse, adverse outcome.
- Sentence evidence is available for harmful, so synonym choice can be checked against real usage rather than a flat word list.
- Ranking signals come from derived_reverse, moby, opengloss.
Synonym selection checklist
- Match the part of speech before comparing meanings.
- Check whether the synonym changes intensity, formality, or emotional tone.
- Read the replacement inside the full sentence, not just beside "harmful".
- Prefer the clearest word over the most unusual word when writing for speed or comprehension.
When not to replace "harmful"
Keep "harmful" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Replacement workflow
1. Preserve meaning
Choose a synonym only if it keeps the core idea of "harmful" intact in the sentence you are editing.
2. Tune tone
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
3. Re-read context
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
Final fit check
After choosing a replacement for "harmful", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "harmful" or choose a simpler alternative from the closest-match group.
Related word relations
OpenGloss and ConceptNet supply richer edges like generalizations, collocations, and derivations.
More general
3 entriesMore specific
3 entriesCollocations
5 entriesharmful behaviorharmful effectharmful exposureharmful impactharmful substance
Inflections
2 entriesmore harmfulmost harmful
Derivations
5 entriesAntonyms
1 entriessimilar
40 entriesShowing 16 of 40 words.
Sample sentences
13 total sentences available.
Smoking is harmful to health.
Source: tatoeba (19940)
There is no denying the fact that smoking is harmful.
Source: tatoeba (19962)
Smoking is harmful to your health.
Source: tatoeba (25891)
Showing 4 of 13 available sentences.
Common questions
What are the closest synonyms for "harmful"?
Closest matches include abusive, abusive conduct, abusive language, adverse, adverse outcome.
How should I check whether a synonym fits "harmful"?
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.