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WordNet-Online
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Adjective harmless has 5 senses
- harmless - not causing or capable of causing harm; "harmless bacteria"; "rendered the bomb harmless"
Antonyms: harmful, abusive, bad, bruising, calumniatory, calumnious, defamatory, denigrative, denigrating, denigratory, libellous, libelous, slanderous, catastrophic, ruinous, counterproductive, damaging, detrimental, prejudicial, prejudicious, ill, insidious, pernicious, subtle, mischievous, nocent, stabbing, traumatic, wounding, deleterious, hurtful, injurious
- innocuous, harmless - not injurious to physical or mental health
- harmless - not producing any toxic effects
Antonym: toxic (indirect, via nontoxic)
- harmless, innocuous - unlikely to harm or disturb anyone; "harmless old man"
Antonyms: dangerous, unsafe (indirect, via safe)
- harmless, nonmalignant - not threatening to life or health; not malignant; "a benign tumor is usually harmless"
Antonym: malign (indirect, via benign)
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