dangerous

形容词 dangerous:

1. involving or causing danger or risk; liable to hurt or harm
   同义词：unsafe
2. causing fear or anxiety by threatening great harm
   同义词：grave, grievous, serious, severe, life-threatening

1. This decision creates a dangerous precedent.
   这个决定开创了一个危险的先例。
2. Icy roads are dangerous.
   覆盖着冰的道路很危险。
3. That dog is a dangerous brute; it bites people.
   那条狗是危险的畜牲，它咬人。
4. A little learning is a dangerous thing.
   一知半解，为害不浅。
5. We should pay more attention to the infection of young people with dangerous ideologies.
   我们应该多注意危险的思想意识对年轻人的影响。
6. Many dangerous diseases are carried by insects.
   许多危险的疾病是由昆虫传播的。
7. It's dangerous to be so near to the tiger.
   离老虎那么近是很危险的。
8. His dog looks dangerous.
   他的狗看上去很危险。

dan.ger.ous

adj.（形容词）
Involving or filled with danger; perilous.
危险的：涉及到或充满危险的；危机四伏的
Being able or likely to do harm.
能或可能受危害的

【引伸】
dan.gerously
adv.（副词）
dan.gerousness
n.（名词）