1) Boggy 2) Covered with gunk 3) Covered with mud or muck 4) Covered with slimy gunk 5) Covered with sludge 6) Dirty 7) Dirty and messy 8) Full of gooey dirt 9) Full of gunk 10) Marshy 11) Miry 12) Muddy 13) Nasty 14) Of or like muck 15) Oozy 16) Quaggy 17) Slang for rude 18) Sloughy 19) Soft and watery Found on https://www.crosswordclues.com/clue/mucky
Muck'y adjective 1. Filthy with muck; miry; as, a mucky road. ' Mucky filth.' Spenser. 2. Vile, in a moral sense; sordid. [ Obsolete] Spenser. « Mucky money and false felicity.» Latimer. Found on http://www.encyclo.co.uk/webster/M/110
of or like muck. · filthy, dirty, or slimy. · a mucky story. · obscene:a mucky story. · nasty; mean or contemptible:a mucky trick. · (of weather) oppressively humid. Found on https://www.infoplease.com/dictionary/mucky