Definify.com
Webster 1913 Edition
Dangerous
Dan′ger-ous
,Adj.
 1. 
Attended or beset with danger; full of risk; perilous; hazardous; unsafe. 
Our troops set forth to-morrow; stay with us;
The ways are
The ways are
dangerous
. Shakespeare
It is 
dangerous 
to assert a negative. Macaulay.
2. 
Causing danger; ready to do harm or injury. 
If they incline to think you 
To less than gods.
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
– My lord to me is hard and
dangerous
. Chaucer.
Dan′ger-ous-ly
, adv.
 Dan′ger-ous-ness
, Noun.
Webster 1828 Edition
Dangerous
DANGEROUS
,Adj.
 1.
  Perilous; hazardous; exposing to loss; unsafe; full of risk; as a dangerous voyage; a dangerous experiment.2.
  Creating danger; causing risk of evil; as a dangerous man; a dangerous conspiracy.Definition 2025
dangerous
dangerous
English
Adjective
dangerous (comparative more dangerous, superlative most dangerous)
-  Full of danger.
- Railway crossings without gates are highly dangerous.
 
-  1915, Emerson Hough, The Purchase Price, chapterI:
- “[…] it is not fair of you to bring against mankind double weapons ! Dangerous enough you are as woman alone, without bringing to your aid those gifts of mind suited to problems which men have been accustomed to arrogate to themselves.”
 
 
 -  Causing danger; ready to do harm or injury.
-  John Milton (1608-1674)
- If they incline to think you dangerous / To less than gods
 
 
 -  John Milton (1608-1674)
 -  (colloquial, dated) In a condition of danger, as from illness; threatened with death.
- Forby. Bartlett.
 
 -  (obsolete) Hard to suit; difficult to please.
-  Geoffrey Chaucer (c.1343-1400)
- My wages ben full strait, and eke full small; / My lord to me is hard and dangerous.
 
 
 -  Geoffrey Chaucer (c.1343-1400)
 -  (obsolete) Reserved; not affable.
-  Geoffrey Chaucer (c.1343-1400)
- Of his speech dangerous
 
 
 -  Geoffrey Chaucer (c.1343-1400)
 
Usage notes
The standard comparative and superlative are more dangerous and most dangerous; the forms dangerouser and dangerousest exist but are nonstandard.
Synonyms
(full of danger):
Antonyms
Related terms
Translations
full of danger
 
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causing danger, ready to do harm or injury