EstonianVituvihaWhen a woman hates another woman because she's better-looking, brighter or more successful than her.

Literally, something like "cunt hate", given that *vitt* is a derogatory term for female genitalia, and that *viha* here implies an irrational kind of hate possibly stemming from envy or female rivalry. It's like a primordial rage that a woman has against all other women just because she's not the most desired woman around.