Princeton's WordNet

1. dangerous, unsafe(adj)

   involving or causing danger or risk; liable to hurt or harm

   "a dangerous criminal"; "a dangerous bridge"; "unemployment reached dangerous proportions"

2. dangerous, grave, grievous, serious, severe, life-threatening(adj)

   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"

Kernerman English Learner's Dictionary

1. dangerous(adjective)ˈdeɪn dʒər əs, ˈdeɪndʒ rəs

   likely to cause damage or harm

   a dangerous road; a dangerous situation; Skydiving is too dangerous.; dangerous to wildlife; it's dangerous for sb to do sth; dangerously close to the edge; Steve enjoys living dangerously.

Wiktionary

1. dangerous(Adjective)

   Full of danger.

2. dangerous(Adjective)

   Causing danger; ready to do harm or injury.

   If they incline to think you dangerous / To less than gods uE000108495uE001 Milton.

3. dangerous(Adjective)

   In a condition of danger, as from illness; threatened with death.

   Forby. Bartlett.

4. dangerous(Adjective)

   Hard to suit; difficult to please.

   My wages ben full strait, and eke full small; / My lord to me is hard and dangerous. uE000108496uE001 Chaucer.

5. dangerous(Adjective)

   Reserved; not affable.

   Of his speech dangerous uE000108497uE001 Chaucer.

Webster Dictionary

1. Dangerous(adj)

   attended or beset with danger; full of risk; perilous; hazardous; unsafe

2. Dangerous(adj)

   causing danger; ready to do harm or injury

3. Dangerous(adj)

   in a condition of danger, as from illness; threatened with death

4. Dangerous(adj)

   hard to suit; difficult to please

5. Dangerous(adj)

   reserved; not affable

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