Should "Megan is a pretty girl." be accepted?
What's the difference between golygus, hardd, prydferth etc.?
You can see them in an on-line dictionary such as www.gweiadur.com. There is a degree of overlap with lots of words, these included, and so the course just goes with the most common ones.
golygus is generally 'handsome, good-looking' and so can be applied to both men and women.