名詞 inactivity:

1. the state of being inactive
   同義詞：inaction, inactiveness
2. a disposition to remain inactive or inert
   同義詞：inactiveness, inertia
3. being inactive; being less active

1. After days of inactivity, the enemy finally showed its teeth by a frontal attack on our position.
   幾天沒動靜之后，敵人終于齜牙咧嘴地向我們的陣地發(fā)動了正面的進攻。
2. She has bouts of hard work followed by long periods of inactivity.
   她總是努力干上一陣，然后一呆就是很長時間。