forcefulnesses

The forcefulness of the wind knocked over our garden chairs.

风的猛烈把我们花园里的椅子都吹倒了。

She spoke with such forcefulness that the whole room fell silent.

她讲话如此有力，整个房间都安静下来。

His presentation lacked forcefulness, so nobody remembered it afterward.

他的演示缺乏力度，所以后来没人记得它。