1. superlative form of filthy; extremely dirty or unclean
2. superlative form of filthy; extremely offensive, obscene, or vulgar
Usage: informal

Examples

• The filthiest part of the old warehouse was the basement, covered in decades of grime.
• After playing in the mud all day, the children were the filthiest I'd ever seen them.
• He used the filthiest language imaginable when he got angry.
• The filthiest conditions in the factory violated every health code.
• That was the filthiest joke I've heard all year.
• The filthiest streets in the city needed immediate cleaning.