在英文中，女性的花心通常用"fickle"或"indecisive"来形容。
"Fickle"是指喜欢改变意见或做法的，有时也用来指性格不稳定的人。例如：
She's very fickle and never seems to stick with anything for very long.
He's a fickle person and it's hard to know what he'll do next.
"Indecisive"是指不能做决定的，常常犹豫不决。例如：
She's always been indecisive and it takes her a long time to make up her mind.
He's so indecisive that he can't even decide what to have for dinner.
这两个词都可以用来形容女性的花心，但是需要注意的是，这两个词常常被用来贬低别人，所以在使用时要注意礼貌。