While I'm not completely sure what you are trying to say, let me take a few stabs at it:

The harder it is to define a notion, the greater chance it came from a woman.

Try also:

The harder it is to understand an idea, the more likely it is that it came from a woman.

That implies women come up with ideas that are hard to understand. Or if you're trying to say that, the harder it is to explain something the more likely that you're talking to a woman, then try

The harder it is to explain something to someone, then the more likely it is that you're explaining it to a woman.

While I'm not completely sure what you are trying to say, let me take a few stabs at it:

The harder it is to define a notion, the greater chance it came from a woman.

Try also:

The harder it is to understand an idea, the more likely it is that it came from a woman.

That implies women come up with ideas that are hard to understand. Or if you're trying to say that, the harder it is to explain something the more likely that you're talking to a woman, then try

The harder it is to explain something to someone, then the more likely it is that you're explaining it to a woman.

Edit: Based on feedback above

The more abstract and vague that a value or principle is, such as freedom or justice, then the more likely it (is/has been) personified as a (women/female).

I strongly prefer stating it as "personified as" rather than "taking the form of". Because clouds in the sky take the form of objects we're familiar with, while the Statue of Liberty is the personification of freedom.