sudden

1. ADJ Sudden means happening quickly and unexpectedly. 突然的

He had been deeply affected by the sudden death of his father-in-law. 他深受其岳父突然辞世的影响。

It was all very sudden. 一切都非常突然。

2. suddennessN-UNCOUNT 突然性

The enemy seemed stunned by the suddenness of the attack. 敌人似乎被这次袭击的突如其来惊呆了。

3. PHRASE If something happens all of a sudden, it happens quickly and unexpectedly. 突然地

All of a sudden she didn't look sleepy any more. 突然她看上去不再困倦了。