When it comes to talking about an unpleasant woman, there are several synonyms that one can use to describe the situation better. Depending on context, she could be called a shrew, a harpy, a termagant, a battle-axe, or even a nag. All of these words imply a certain level of harshness or unpleasantness in personality and behavior that can be off-putting to others. Other synonyms that come to mind include harridan, virago, and witch, all of which suggest a certain level of cruelty or vengefulness. Regardless of which word you choose, the important thing is to make it clear that the woman in question is unpleasant and not particularly easy to get along with.