Source : Webster's Revised Unabridged Dictionary (1913)

Bluish \Blu"ish\, a.
   Somewhat blue; as, bluish veins. ``Bluish mists.'' --Dryden.
   -- {Blu"ish*ly}, adv. -- {Blu"ish*ness}, n.

Source : WordNet®

bluish
     adj : having a color similar to that of a clear unclouded sky;
           "October's bright blue weather"- Helen Hunt Jackson; "a
           blue flame"; "blue haze of tobacco smoke" [syn: {blue},
            {blueish}, {light-blue}, {dark-blue}, {blue-black}]