murky

Hard to see through, as a fog or mist.

The Streets of London, to be beheld in the very height of their glory, should be seen on a dark, dull, murky, winter's night, when there is just enough damp gently stealing down to make the pavement greasy without cleansing it of any of its impurities, […]

Dark, dim, gloomy.

Ferdinand: As I hope / For quite dayes, faire Iſſue, and long life, / With ſuch loue, as 'tis now the murkieſt den, / The moſt opportune place, the ſtrongſt ſuggeſtion, / Our worſer Genius can, shall neuer melt / Mine honor into luſt,[…]

The future of the Deferred Action for Childhood Arrivals program got murkier Tuesday when the Texas attorney general made good on a threat to challenge it in court.

Cloudy, indistinct, obscure.

murky waters

murky territory

Dishonest, shady.

Ever since X-Men: First Class set the series' clock back a few decades and installed Michael Fassbender's moody Magneto and James McAvoy's louche Charles Xavier as replacements for Ian McKellen and Patrick Stewart's chess-playing pappies, the big-screen X-Men's central conflict—Xavier's Booker T. Washington-esque School For Gifted Youngsters vs. a rogue's gallery of evil mutants, crew cuts, and politicos—has gotten a lot murkier.