1. crux - Noun
2. Crux - Proper noun
Anything that is very puzzling or difficult to explain.
Source: Webster's dictionaryMoney was the crux. Raising money to pay the cost of war was to cause more damage to 14th century society than the physical destruction of war itself. Barbara Tuchman
Not only the entire ability to think rests on language... but language is also the crux of the misunderstanding of reason with itself. Johann Georg Hamann
To change our idea of the world is the crux of shamanism. And stopping the internal dialogue is the only way to accomplish it. Carlos Castaneda
The crux is the reform of the treaty which would lead to common action. There must be a will to defend the central interests of Europe. If there is no majority voting, then the same level of impotence will continue. Jacques Delors
When a thing is said to be not worth refuting you may be sure that either it is flagrantly stupid - in which case all comment is superfluous - or it is something formidable, the very crux of the problem. Percy Bysshe Shelley
What else do I have to offer? Nothing happens to me anymore. That's the reality of getting old, and I guess that's really the crux of the matter. I'm not ready to be old yet. Sara Gruen