Harmful synonyms | Best 123 synonyms for harmful

menacing

Threatening.

23

5

hurtful

Tending to impair or damage; injurious; mischievous; occasioning loss or injury.

24

10

toxic

Capable of causing injury or death, especially by chemical means; poisonous.

14

2

ill-omened

Having a bad omen; inauspicious; unlucky.

13

1

wounding

Causing harm or injury

13

3

bad

Not good; unfavorable; negative.

12

3

unharmful (antonym)

Not harmful.

8

5

baleful

Portending evil; ominous.

3

0

nocuous

Likely to cause harm or damage

3

0

consumptive

Consuming or tending to consume.

3

0

painful

Distressing or embarrassing:

3

0

pernicious

Causing great injury, destruction, or ruin; fatal; deadly

3

0

annihilative

Capable of causing utter destruction or serving to destroy utterly:

3

0

crippling

That cripples

3

1

malicious

Of, pertaining to, or as a result of malice or spite

2

0

malignant

Very harmful, dangerous, or virulent

2

0

sinful

Containing or consisting in sin; contrary to the will of a god, goddess, gods and/or goddesses.

2

0

baneful

Portending harm; ominous.

2

0

unwholesome

Not sound; diseased; tainted; impaired; defective.

2

0

deleterious

Having a harmful effect; injurious:

2

0

damaging

Harmful; injurious; causing damage.

2

0

unfortunate

Not favored by fortune

2

0

carcinogenic (related)

2

0

dangerous (related)

2

0

dire

Dire is defined as something that is urgent.

1

0

devouring

Causing harm or injury

1

0

vicious

Evil, immoral or depraved.

1

0

insidious

Beguiling but harmful; alluring:

1

0

devastating

Causing devastation

1

0

disastrous

Of the nature of a disaster; causing great harm, damage, etc.; calamitous

1

0

murderous

(Informal) Capable of devastating or overwhelming:

1

0

undetermining

Causing harm or injury

1

0

destructive

Tending or likely to cause destruction

1

0

stunting

Causing harm or injury

1

0

killing

That literally deprives of life; lethal, deadly, fatal.

1

0

fatal

Very destructive; most unfortunate; disastrous

1

0

costly

Of high price or value; expensive:

1

0

fraught with evil

Causing harm or injury

1

0

extirpative

Of, relating to, or pertaining to an extirpation.

1

0

afflicting

Causing harm or injury

1

0

fell

Fierce; terrible; cruel

1

0

diabolic

Very wicked or cruel

1

0

unhealthful

Not healthy; detrimental to health.

1

0

satanic

Of, pertaining to or resembling Satan (the Devil).

1

0

ill

Promising trouble; unfavorable; unfortunate; unpropitious

1

0

grievous

Causing suffering; hard to bear; severe

1

0

mortal

Conceivable; imaginable:

1

0

lethal

Causing or capable of causing death; fatal or deadly

1

0

malevolent

Malevolent is defined as someone or something that is harmful or evil.

1

0

mephitic

Of or caused by mephitis

1

0

venomous

(Zool.) Having a poison gland or glands and able to inflict a poisonous wound by biting or stinging

1

0

cruel

(Slang) Cool; awesome; neat.

1

0

disadvantageous

Not advantageous.

1

0

felonious

Of, relating to, being, or having the quality of felony; malignant; malicious; villainous; traitorous; perfidious.

1

0

aching

Full of painful yearning or sorrow:

1

0

pricking

Causing harm or injury

1

0

objectionable

Open to objection

1

0

fiendish

Extremely vexatious or difficult

1

0

unpropitious

Not propitious; unfavourable, untimely

1

0

unlucky

Resulting or likely to result in misfortune; inauspicious:

1

0

malign

Showing ill will; malicious

1

0

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.

1

0

noisome

Offensive to the senses; disgusting, unpleasant, nauseous; foul, fetid, especially having an undesirable smell; sickening, nauseating.

1

0

corrosive

Having the quality of fretting or vexing.

1

0

poisonous (related)

Capable of injuring or killing by or as by poison; containing, or having the effects of, a poison; toxic; venomous

1

0

wicked (related)

Naughty in a playful way; mischievous

1

0

catastrophic

Involving or resulting in substantial, often ruinous medical expense:

1

0

deadly

Oppressively tiresome

1

0

detrimental

Causing damage or harm; injurious.

1

0

hazardous

Depending on chance; risky.

1

0

injurious

Causing physical harm or injury; harmful.

1

0

nasty

Very unpleasant; objectionable

1

0

noxious

Harmful to the mind or morals; corrupting:

1

0

prejudicial

Causing or tending to cause harm, especially to a legal case:

1

0

ruinous

Bringing or tending to bring ruin; very destructive or harmful; disastrous

1

0

unhealthy

Characterized by or symptomatic of disturbed mental health:

1

0

unsafe

Not safe; dangerous.

1

0

harmless (antonym)

Not intended to harm or offend; inoffensive.

1

0

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.

1

0

aiding (antonym)

injurious, hurtful

1

0

assisting (antonym)

injurious, hurtful

1

0

nice (antonym)

Used as an intensive with and :

1

0

evil

(Computing, programming, slang) undesirable; harmful; bad practice

1

0

help (related)

Causing harm or injury

1

0

undesirable (related)

1

0

harm (related)

1

0

mischievous

The definition of mischievous is someone or something that causes harm or likes to play and annoy with tricks.

3

malefic

Having or exerting a malignant influence.

1

internecine

Characterized by struggle within a group, usually applied to an ethnic or familial relationship.

1

inimical

Like an enemy; hostile; unfriendly

1

harassing

Causing harm or injury

1

sinister

Causing or intending harm or evil; wicked:

1

subversive

Tending or seeking to subvert, overthrow, or destroy (an established government, institution, belief, etc.)

1

incendiary

Causing or designed to cause fires, as certain substances, bombs, etc.

1

calamitous

Concerning or involving calamity, disastrous.

1

distressing

Causing distress; upsetting

1

demoniac

Possessed, produced, or influenced by a demon:

1

maleficent

Harmful or evil in intent or effect.

1

devilish

Very great; extreme

1

adverse

Unfavorable; harmful

1

virulent

Extremely hostile or malicious:

1

2

cataclysmic

Of or pertaining to a cataclysm; causing great destruction or upheaval; catastrophic.

1

2

corroding

Causing harm or injury

1

2

pestilential

Like or constituting a pestilence; widespread and deadly

1

2

pestiferous

Containing organisms that cause contagious diseases

1

2

corrupting

Causing harm or injury

1

2

morbific

Causing or leading to disease

1

2

corrupt

Deteriorated from the normal or standard

1

2

treacherous

Deceitful; inclined to betray.

1

2

wild

(Slang) Extraordinary; remarkable

1

2

sapping

Causing harm or injury

1

2

habit-forming

Capable of leading to physiological or psychological dependence:

1

2

serious

Really intending what is said; being in earnest; not jesting or deceiving; meaningful.

1

2

fraught with harm

Causing harm or injury

1

2

doing harm

Causing harm or injury

1

2

sore

Painful to the touch; tender.

1

2

brutal

Plain and direct, although distressing in effect

1

2

pure (antonym)

(Philosophy) Free of empirical elements:

1

2

healthful (antonym)

Healthy.

1

2

good (antonym)

(Especially when capitalized) Holy.

1

2

ominous (related)

Specifically, giving indication of a coming ill; being an evil omen; threatening; portentous; inauspicious.

1

2

pestilent

Likely to cause death; deadly

1

2

demolitionary

Causing harm or injury

1

3

Harmful synonyms and antonyms

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