'Heavy' in the Bible

Give glory to the LORD your God before he brings darkness, before your feet stumble on the mountains at twilight. You hope for light, but he turns it into deep darkness. He changes it into heavy gloom.

The bronze of the items that King Solomon made for the Lord's temple (including the two pillars, the large bronze basin called "The Sea," the twelve bronze bulls under "The Sea," and the movable stands) was too heavy to be weighed.