lousy vs filthy

lousy and filthy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
lousy	No	Yes	No	No
filthy	No	Yes	No	No

As adjectives, lousy and filthy are synonyms defined as:

Other synonyms of lousy include dirty.

lousy (adjective)	filthy (adjective)
very bad	disgustingly dirty; filled or smeared with offensive matter
infested with lice	characterized by obscenity
vile; despicable	vile; despicable