the enormity of something (of a problem, etc.) the very great size, effect, etc. of something; the fact of something being very serious (Oxford)
very great size or importance (Cambridge)
People are still coming to terms with the enormity of the disaster. (Oxford)
It’s difficult to grasp the sheer enormity of the tragedy. (Oxford)
I don't think you realize the enormity of the problem. (Cambridge)
enormity of the disaster
enormity of the tragedy
enormity of the problem
Monstrosity
Horror
Tininess
Goodness
Enormous
Enormously