niechluj in English:

a lazy slob, you're an ignorant slob

He's such a slob, he always wears dirty, crumpled clothes.

And how will Felix handle Oscar's slobbish lifestyle, his untidy apartment and his insistence that he ‘likes it just the way it is’.

Don't be such a slob! Take a shower! Comb your hair!

He's a big fat slob of a man - I can't stand him; He may seem like a slob at home, but he dresses quite professionally when he goes out, often wearing suits when he goes to work.

a working slob

a scruffy old T-shirt