Harmful synonyms
Category:
Part of speech:
Not good; unfavorable; negative.
Capable of causing injury or death, especially by chemical means; poisonous.
unharmful (antonym)
Not harmful.
Causing harm or injury
Having a bad omen; inauspicious; unlucky.
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The definition of mischievous is someone or something that causes harm or likes to play and annoy with tricks.
Consuming or tending to consume.
Distressing or embarrassing:
Causing great injury, destruction, or ruin; fatal; deadly
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Possessed, produced, or influenced by a demon:
Unfavorable; harmful
Very harmful, dangerous, or virulent
Containing or consisting in sin; contrary to the will of a god, goddess, gods and/or goddesses.
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Portending harm; ominous.
Like or constituting a pestilence; widespread and deadly
Containing organisms that cause contagious diseases
Having a harmful effect; injurious:
Capable of causing utter destruction or serving to destroy utterly:
Causing harm or injury
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Dire is defined as something that is urgent.
Causing or leading to disease
Causing harm or injury
Causing prejudice, or harm; injurious; detrimental
Deteriorated from the normal or standard
Beguiling but harmful; alluring:
Causing devastation
Involving or resulting in substantial, often ruinous medical expense:
Of the nature of a disaster; causing great harm, damage, etc.; calamitous
(Slang) Extraordinary; remarkable
(Informal) Capable of devastating or overwhelming:
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undetermining
Causing harm or injury
Causing harm or injury
Tending or likely to cause destruction
Harmful to morals or character
Causing harm or injury
Capable of leading to physiological or psychological dependence:
Very destructive; most unfortunate; disastrous
Really intending what is said; being in earnest; not jesting or deceiving; meaningful.
Of high price or value; expensive:
doing harm
Causing harm or injury
fraught with evil
Causing harm or injury
Painful to the touch; tender.
extirpative
Of, relating to, or pertaining to an extirpation.
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Causing harm or injury
Fierce; terrible; cruel
Very wicked or cruel
Plain and direct, although distressing in effect
Not healthy; detrimental to health.
Promising trouble; unfavorable; unfortunate; unpropitious
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Causing suffering; hard to bear; severe
Conceivable; imaginable:
Causing or capable of causing death; fatal or deadly
Malevolent is defined as someone or something that is harmful or evil.
Of or caused by mephitis
(Zool.) Having a poison gland or glands and able to inflict a poisonous wound by biting or stinging
Full of painful yearning or sorrow:
Causing harm or injury
Open to objection
Extremely vexatious or difficult
Resulting or likely to result in misfortune; inauspicious:
Showing ill will; malicious
sinistrous
Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
Offensive to the senses; disgusting, unpleasant, nauseous; foul, fetid, especially having an undesirable smell; sickening, nauseating.
Very great; extreme
pure (antonym)
(Philosophy) Free of empirical elements:
healthful (antonym)
Healthy.
dangerous (related)
Causing danger; ready to do harm or injury.
deadly (related)
Very harmful; destructive
ominous (related)
Specifically, giving indication of a coming ill; being an evil omen; threatening; portentous; inauspicious.
poisonous (related)
Capable of injuring or killing by or as by poison; containing, or having the effects of, a poison; toxic; venomous
wicked (related)
Naughty in a playful way; mischievous
Causing damage or harm; injurious.
Depending on chance; risky.
Very unpleasant; objectionable
Harmful to the mind or morals; corrupting:
Bringing or tending to bring ruin; very destructive or harmful; disastrous
Not safe; dangerous.
harmless (antonym)
Not intended to harm or offend; inoffensive.
helpful (antonym)
The definition of helpful is someone or something that is useful, that provides assistance or aid, or that is prone to providing aid.
aiding (antonym)
injurious, hurtful
assisting (antonym)
injurious, hurtful
nice (antonym)
Used as an intensive with and :
(Computing, programming, slang) undesirable; harmful; bad practice
help (related)
Causing harm or injury
undesirable (related)
carcinogenic (related)
harm (related)
Having or exerting a malignant influence.
Like an enemy; hostile; unfriendly
Causing harm or injury
Causing or intending harm or evil; wicked:
Tending or seeking to subvert, overthrow, or destroy (an established government, institution, belief, etc.)
Causing or designed to cause fires, as certain substances, bombs, etc.
Concerning or involving calamity, disastrous.
Of or pertaining to a cataclysm; causing great destruction or upheaval; catastrophic.
Causing harm or injury
fraught with harm
Causing harm or injury
Likely to cause death; deadly
demolitionary
Causing harm or injury
Extremely hostile or malicious:
Find another word for harmful. In this page you can discover 123 synonyms, antonyms, idiomatic expressions, and related words for harmful, like: hurtful, menacing, bad, toxic, unharmful, wounding, ill-omened, mischievous, baleful, nocuous and consumptive.