Despise 鄙视；蔑视；看不起
I despise you.
我鄙视你。

Loathe/Loathsome 极不喜欢；厌恶
You loathsome little swine.
你这个小讨厌鬼。

You are the Monday of my life. 看到你我就想死。

You make me want to throw up/puke/vomit. 你让我想吐。你让我恶心。

You suck. 你真恶心！
I can't believe how much you suck!
真不敢相信你有多恶心！

I don't exactly hate you but if you were on fire and I had water, I'd drink it.
我不真的恨你，但是如果你着火了，我又刚好有水，我会喝了它（水）。