The Collaborative International Dictionary of English v.0.48:
Yellowish \Yel"low*ish\, a. Somewhat yellow; as, amber is of a yellowish color. -- Yel"low*ish*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
yellowish adj 1: of the color intermediate between green and orange in the color spectrum; of something resembling the color of an egg yolk [syn: yellow, yellowish, xanthous]