这块石头的沉重让我们很难搬动它。

The ___heaviness of the stone made it hard for us to move.

听到这个消息后，她心里有一种说不出的沉重感。

After hearing the news, she felt an unexplainable ___heaviness in her heart.

他动作的迟缓显示出他昨晚没睡好。

The ___heaviness of his movements suggested he hadn't slept well last night.