(filthier, filthiest)
1.
Something that is ~ is very dirty indeed.
He never washed, and always wore a ~ old jacket.
= grimy
ADJ
2.
If you describe something as ~, you mean that you think it is morally very unpleasant and disgusting, sometimes in a sexual way.
The play was full of ~ foul language.
ADJ disapproval
3.
~ rich: see rich