filthier; filthiest
1
: very dirty
filthy clothes
filthy streets
2
a
: very offensive or disgusting and usually about sex
a filthy movie/joke
He has a filthy mouth. [=he uses language that is very offensive]
b
: very evil : morally wrong
filthy tactics
That's a filthy lie!
c
: very bad
He has a filthy temper. [=he gets angry very easily]
She's in a filthy mood.
(chiefly Brit) We've been having filthy weather.
informal
: very
He's filthy rich. [=he's extremely rich; he has so much money that his wealth is disgusting or offensive]
Her clothes were filthy dirty. [=extremely dirty]
Cite this Entry
“Filthy.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/filthy. Accessed 27 Jul. 2026.
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