DANGEROUS
dangerous, grave, grievous, serious, severe, life-threatening
(adjective) causing fear or anxiety by threatening great harm; “a dangerous operation”; “a grave situation”; “a grave illness”; “grievous bodily harm”; “a serious wound”; “a serious turn of events”; “a severe case of pneumonia”; “a life-threatening disease”
dangerous, unsafe
(adjective) involving or causing danger or risk; liable to hurt or harm; “a dangerous criminal”; “a dangerous bridge”; “unemployment reached dangerous proportions”
Source: WordNet® 3.1
Etymology
Adjective
dangerous (comparative more dangerous, superlative most dangerous)
Full of danger.
Causing danger; ready to do harm or injury.
(colloquial, dated) In a condition of danger, as from illness; threatened with death.
(obsolete) Hard to suit; difficult to please.
(obsolete) Reserved; not affable.
Usage notes
The standard comparative and superlative are more dangerous and most dangerous; the forms dangerouser and dangerousest or dangerest exist but are nonstandard.
Synonyms
(full of danger)
• hazardous
• perilous
• risky
• unsafe
• See also dangerous
Antonyms
• (full of danger): safe, harmless
Anagrams
• nose guard, noseguard
Source: Wiktionary
Dan"ger*ous, a. Etym: [OE., haughty, difficult, dangerous, fr. OF.
dangereus, F. dangereux. See Danger.]
1. Attended or beset with danger; full of risk; perilous; hazardous;
unsafe.
Our troops set forth to-morrow; stay with us; The ways are dangerous.
Shak.
It is dangerous to assert a negative. Macaulay.
2. Causing danger; ready to do harm or injury.
If they incline to think you dangerous To less than gods. Milton.
3. In a condition of danger, as from illness; threatened with death.
[Colloq.] Forby. Bartlett.
4. Hard to suit; difficult to please. [Obs.]
My wages ben full strait, and eke full small; My lord to me is hard
and dangerous. Chaucer.
5. Reserved; not affable. [Obs.] "Of his speech dangerous." Chaucer.
– Dan"ger*ous*ly, adv.
– Dan"ger*ous*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition