From WordNet (r) 2.0 (August 2003) [wn]:
greyish
adj : an achromatic color of any lightness between the extremes of
black and white; "gray flannel suit"; "hair just
turning gray" [syn: gray, grey, grayish]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
greyish \grey"ish\ adj.
somewhat gray.
Syn: grayish.
[WordNet 1.5]