There is this famous statement (B"R 78:9): Esav Soneh l'Ya'akov.
Although the Tenach states Esav bore a grudge (Genesis 27:41) in his heart, and showed great animosity in wanting to kill Ya'akov, the word soneh isn't used.
But I still would like to know what it means when Esav soneh Ya'akov, because in the story of Yosef and his brothers it seems to mean despised (Genesis 37:4,5,8). And in the story of Rachel and Leah (Genesis 29:31-33) it seems to mean something like abhor/revulsion or something likewise.
It seems to mean 'to feel intense dislike' for someone/something, more than it does mean 'to feel intense anger or hostility' towards someone/something.
So what does שׁנה שׂנא mean? how should one define such terms?