adj. 25B6; adjective
a murky winter afternoon : DARK, gloomy, grey, leaden, dull, dim, overcast, cloudy, clouded, sunless, dismal, dreary, bleak; poetic/literary tenebrous.
murky water : DIRTY, muddy, cloudy, turbid; N. Amer. riled, roily.
her murky past : QUESTIONABLE, suspicious, suspect, dubious, dark, mysterious, secret; informal shady.
bright, clear.