Source : Webster's Revised Unabridged Dictionary (1913)

Mirky \Mirk"y\, a.
   Dark; gloomy. See {Murky}.

Source : WordNet®

mirky
     adj 1: (of especially liquids) clouded as with sediment; "a cloudy
            liquid"; "muddy coffee"; "murky waters" [syn: {cloudy},
             {muddy}, {murky}, {turbid}]
     2: so shaded as to be dark or gloomy; "a murky dungeon"; "murky
        rooms lit by smoke-blackened lamps" [syn: {murky}]
     [also: {mirkiest}, {mirkier}]