IPA: /ˈfɪl.θi/
KK: /ˈfɪlθi/
Something that is very dirty or unclean, often in a way that is unpleasant or disgusting.
The children came home with filthy clothes after playing in the mud.
Comparative: filthier
Superlative: filthiest
In a very dirty or unpleasant way.
The room was filthy, with trash everywhere.
Filthy originates from Old English 'filt' (meaning dirt or filth) combined with the suffix '-y' (meaning characterized by). The word 'filthy' describes something characterized by dirt or uncleanliness.
Think of 'filth' as dirt, and remember that 'filthy' means something that is characterized by dirt.
No commonly confused words.