1) Clouded as with sediment 2) Cloudy 3) Dark or gloomy 4) Darkly obscure 5) Darkly vague 6) Hard to see through 7) Intensely dark 8) Like dirty water 9) Like muddy waters 10) Like swamp water 11) Mirky 12) Muddy 13) Not pellucid 14) Obscured by haze 15) Obscured with smoke 16) Opaque 17) Steeped in gloom Found on https://www.crosswordclues.com/clue/murky
[Adjective] Something which is dark or unclear. Example: The water in the pond was very murky and you couldn't see the bottom.
Found on http://www.bbc.co.uk/skillswise/glossary/
dark, gloomy, and cheerless. · obscure or thick with mist, haze, etc., as the air. · vague; unclear; confused: a murky statement. Found on https://www.infoplease.com/dictionary/murky