The word(s) "murky" appears 3 time(s) in 3 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) Until, when he reached the setting of the sun, he found it set in a spring of murky water: Near it he found a People: We said: "O Zul-qarnain! (thou hast authority,) either to punish them, or to treat them with kindness."

(2) Yea, such! - then shall they taste it,- a boiling fluid, and a fluid dark, murky, intensely cold!-

(3) Save a boiling fluid and a fluid, dark, murky, intensely cold,