filthy

As a noun impurity

is the condition of being impure; because of contamination, pollution, adulteration or insufficient purification.

As an adjective filthy is

covered with filth; very dirty.

As adjectives the difference between filthy and false

is that filthy is covered with filth; very dirty while false is (label) one of two states of a boolean variable; logic.

As adjectives the difference between filthy and funky

is that filthy is covered with filth; very dirty while funky is (us|slang) offbeat, unconventional or eccentric.

As adjectives the difference between furious and filthy

is that furious is transported with passion or fury; raging; violent while filthy is covered with filth; very dirty.

As adjectives the difference between filthy and undefined

is that filthy is covered with filth; very dirty while undefined is lacking a definition or value.

Improper is a related term of filthy.

As adjectives the difference between improper and filthy

is that improper is unsuitable to needs or circumstances; inappropriate; inapt while filthy is covered with filth; very dirty.

As a verb improper

is (obsolete|transitive) to appropriate; to limit.

As adjectives the difference between filthy and ugly

is that filthy is covered with filth; very dirty while ugly is displeasing to the eye; not aesthetically pleasing.

As a noun ugly is

(slang|uncountable) ugliness.

As adjectives the difference between filthy and tawdry

is that filthy is covered with filth; very dirty while tawdry is cheap and gaudy; showy.

Unbecoming is a related term of filthy.

As adjectives the difference between unbecoming and filthy

is that unbecoming is not flattering, attractive or appropriate while filthy is covered with filth; very dirty.

Unseemly is a related term of filthy.

As adjectives the difference between unseemly and filthy

is that unseemly is inconsistent with established standards of good form or taste while filthy is covered with filth; very dirty.