dirty除开‘脏’，也有‘卑劣的，龌龊的，卑鄙的，黯淡的、污浊的;见不得人的;污浊的;龌龊的;情色的;淡黄色的;性侵的;令人讨厌的;卑劣的;不守信用的’等词意。

dirty hands/clothes

脏手 / 衣服裤子

a dirty mark

污渍

Try not to get too dirty!

别把的身上弄得很脏！

I always get given the dirty jobs (= jobs that make you become dirty) .

让我去干的全是些粗活。

Dirty oil can hurt a car's engine。

污油会危害轿车的模块。

give sb a dirty look

厌烦地瞪别人一眼；给别人一个眼白

She gave us a dirty look。

她瞥了大家一眼。

Michael gave him a dirty look and walked out.

麦克尔重重地瞪了他一眼随后离开了

a dirty joke/book

龌龊的嘲笑；黄色的书

He's got a dirty mind (= he often thinks about sex) .

他脑子里龌龊事情。

They told dirty jokes and sang raucous ballads

有人说着荤笑话，哼着不着调的小曲儿。

a dirty lie

卑劣的谎话

She's a dirty player.

她是个沒有体育道德的选手。

He's a great man for doing the dirty jobs (= jobs which are unpleasant because they involve being dishonest or mean to people) .

他这个人最会干缺德事的事。

We shouldn't wash our dirty laundry in public and if I was in his position, I'd say nothing at all.

家丑不适合外扬，如果我是他得话，我也你会想我吗。

《柯林斯高阶英汉双解学习词典》

messy是因错乱看上去无秩序的意思。“污浊的;杂乱的;脏乱的;使脏乱差的;使脏乱的;错乱的;无法解决的;让人厌倦的”

This is a messy situation

这是一个错乱的局势。

The house was always messy.

这房屋一直乱七八糟的。

The divorce was painful and messy.

那一次离异让人痛楚而又恩怨不清。

John had been through a messy divorce himself.

罗伯特自身也经历过一次十分繁杂的离异

Dad cooks when Mum is busy, he makes me clean up my messy room

母亲忙的情况下父亲煮饭，他还要我清除我乱七八糟的屋子。

Life is a messy and tangled business

生活就是一件既错乱又繁杂的事儿。