100 Best Synonyms for “Dangerous”

No.	Item	Definition
1.	acute	Severe and urgent.
2.	adverse	Harmful or unfavorable.
3.	aggressive	Ready to attack or harm.
4.	alarming	Causing fear about possible harm.
5.	allergenic	Likely to trigger allergies.
6.	baleful	Threatening harm or evil.
7.	baneful	Causing harm or ruin.
8.	brutal	Cruel, violent, and harmful.
9.	carcinogenic	Able to cause cancer.
10.	catastrophic	Causing extreme damage or loss.
11.	caustic	Able to burn or corrode.
12.	combustible	Able to catch fire.
13.	contagious	Easily spread by contact.
14.	contaminated	Made harmful by unwanted substances.
15.	corrosive	Able to damage by chemical action.
16.	critical	Serious and possibly disastrous.
17.	damaging	Causing harm or injury.
18.	deadly	Able to cause death.
19.	deleterious	Harmful, especially gradually.
20.	destructive	Causing serious damage.
21.	detrimental	Harmful in effect.
22.	dicey	Informally risky or uncertain.
23.	dire	Extremely serious and harmful.
24.	disastrous	Causing great harm or failure.
25.	endangering	Putting at risk of harm.
26.	erratic	Unpredictable and potentially unsafe.
27.	explosive	Able to explode violently.
28.	fatal	Likely to cause death.
29.	fearsome	Causing fear; formidable.
30.	ferocious	Fierce and likely to attack.
31.	fierce	Violent or intensely threatening.
32.	flammable	Easily set on fire.
33.	forbidding	Appearing hostile or threatening.
34.	grave	Seriously concerning or threatening.
35.	hairy	Informally frightening or risky.
36.	harmful	Able to cause damage.
37.	hazardous	Likely to cause harm.
38.	high-risk	Involving a high chance of harm.
39.	hostile	Unfriendly and potentially harmful.
40.	hurtful	Causing harm or pain.
41.	iffy	Informally uncertain or risky.
42.	infectious	Able to spread disease.
43.	injurious	Causing physical or other harm.
44.	insalubrious	Unhealthy or harmful.
45.	insecure	Not safe or firmly fixed.
46.	intimidating	Frightening or threatening.
47.	irritant	Able to cause irritation.
48.	jeopardizing	Putting something at risk.
49.	killer	Informally deadly or extremely harmful.
50.	laden with danger	Carrying many hazards.
51.	lethal	Capable of causing death.
52.	life-endangering	Putting life at risk.
53.	life-threatening	Able to endanger life.
54.	malicious	Intending or causing harm.
55.	malignant	Harmful and likely to worsen.
56.	menacing	Appearing likely to cause harm.
57.	mortal	Able to cause death.
58.	murderous	Extremely violent or deadly.
59.	mutagenic	Able to cause genetic damage.
60.	noxious	Harmful, poisonous, or unpleasant.
61.	ominous	Suggesting future harm.
62.	pathogenic	Able to cause disease.
63.	perilous	Full of serious danger.
64.	pernicious	Very harmful, often subtly.
65.	poisonous	Containing harmful or deadly poison.
66.	precarious	Unstable and potentially unsafe.
67.	questionable	Doubtful or potentially unsafe.
68.	radioactive	Emitting harmful radiation.
69.	reckless	Ignoring danger or consequences.
70.	risk-laden	Filled with risk.
71.	risky	Involving a chance of harm.
72.	ruinous	Causing destruction or severe loss.
73.	savage	Fierce and violent.
74.	serious	Potentially harmful or severe.
75.	severe	Serious and potentially harmful.
76.	shaky	Unstable or unreliable.
77.	sinister	Suggesting hidden danger.
78.	sketchy	Informally suspicious or unsafe.
79.	slippery	Likely to cause slipping.
80.	suspect	Questionable and possibly unsafe.
81.	teratogenic	Able to harm fetal development.
82.	threatening	Suggesting possible harm.
83.	threatful	Full of threat.
84.	touch-and-go	Uncertain and risky.
85.	toxic	Poisonous or seriously harmful.
86.	treacherous	Unstable, deceptive, or hazardous.
87.	unhealthy	Likely to harm health.
88.	unpredictable	Unable to be safely anticipated.
89.	unreliable	Not dependably safe.
90.	unsafe	Not safe; likely to harm.
91.	unsound	Not safe, stable, or reliable.
92.	unstable	Likely to change or fail dangerously.
93.	unsteady	Not stable or secure.
94.	unwholesome	Harmful to health or morals.
95.	venomous	Able to inject harmful venom.
96.	vicious	Cruel, violent, or harmful.
97.	violent	Involving force likely to harm.
98.	virulent	Extremely harmful or infectious.
99.	volatile	Unstable and likely to erupt.
100.	wounding	Causing injury or hurt.