sludge sluddery • sludged · · · Info · Definitions · Synonyms · Characters · · sludge · · Text Latin · · Script 6 · · Length Definitions · · · (noun) the precipitate produced by sewage treatment. · · Noun Definition 1 (noun) any thick, viscous matter. Synonyms: slime, goo, goop, gook, guck, gunk, muck, ooze. · · Noun Definition 2 Synonyms · · · slime · · Synonym 1 goo · · Synonym 2 goop · · Synonym 3 gook · · Synonym 4 guck · · Synonym 5 gunk · · Synonym 6 muck · · Synonym 7 ooze · · Synonym 8 Characters · · d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 l latin small letter l U+006C s latin small letter s U+0073 u latin small letter u U+0075