I. filth ‧ y 1 S3 /ˈfɪlθi/ BrE AmE adjective ( comparative filthier , superlative filthiest )
1 . very dirty:
The house was filthy, with clothes and newspapers strewn everywhere.
2 . showing or describing sexual acts in a very rude or offensive way
filthy language/story/joke etc
Your problem is you’ve got a filthy mind (=you are always thinking about sex) .
3 . showing anger or annoyance
filthy mood/temper
Simon had been drinking and was in a filthy temper.
She gave him a filthy look.
4 . filthy weather/night/day the weather, a night etc that is very cold and wet:
It’s a filthy night to be out.
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THESAURUS
▪ dirty not clean:
His clothes were untidy and he had dirty hands.
▪ filthy very dirty:
Each year filthy water causes millions of cases of illness.
▪ muddy covered with mud:
It had been raining hard and the path was muddy.
▪ dusty covered with dust:
the dusty shelves in the attic
▪ greasy covered with oil or grease:
Greasy food is bad for your health.
▪ grubby ( also mucky British English ) informal fairly dirty and needing to be cleaned or washed:
He was wearing a grubby white T-shirt.
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mucky fingers
▪ grimy covered with thick dirt or dirt that has been there a long time:
I couldn’t see much out of the grimy windows of the train.
▪ dingy /ˈdɪndʒi/ looking dark, dirty, and unpleasant. Used about rooms, houses, and buildings:
We worked in a dingy little office behind the station.
▪ polluted used about land, water, or air that has been made dirty:
85% of city dwellers breathe heavily polluted air.
▪ contaminated made dirty by a dangerous substance or bacteria:
The virus is mainly spread through contaminated food.
▪ squalid /ˈskwɒləd, ˈskwɒlɪd $ ˈskwɑː-/ formal extremely dirty and unpleasant. Used about the place or conditions in which someone lives:
People are living in squalid conditions, with little water and no sanitation.
▪ unhygienic /ʌnhaɪˈdʒiːnɪk◂ $ -ˈdʒe-, -ˈdʒiː-/ formal used about dirty conditions that are likely to cause disease, especially conditions in kitchens, restaurants, and hospitals:
The food was prepared under unhygienic conditions.
▪ unsanitary ( also insanitary British English ) formal used about dirty conditions that are likely to cause disease, especially because there is not a good system for getting rid of waste:
People’s health is being threatened by overcrowded and insanitary homes.
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They work for long hours in unsanitary conditions.
▪ soiled formal made dirty, especially by waste from your body:
Soiled nappies should be changed as quickly as possible.
II. filthy 2 BrE AmE adverb informal
1 . filthy dirty very dirty
2 . filthy rich very rich – usually used to say you think someone has too much money