Consider substituting sensible for the word understand or in the past tense understood.
Alice understood the dangers involved in dating Ralph
Alice was sensible to the dangers involved in dating Ralph
In the latter case the word sensible offers more texture. A greater dimension. Doesn’t always work but when it does it does. Sensible also offers the ability to reverse the meaning more gracefully i.e.; insensible rather that didn’t understand. Note: you should be sensible to the fact that you can’t write didn’t understood.