Source : Webster's Revised Unabridged Dictionary (1913)

Grayish \Gray"ish\, a.
   Somewhat gray.

Source : WordNet®

grayish
     adj : an achromatic color of any lightness between the extremes of
           black and white; "gray flannel suit"; "hair just
           turning gray" [syn: {gray}, {grey}, {greyish}]