Synonyms for Whitish (same or very similar meaning)
WordNet sense 1 (resembling milk in color or cloudiness; not clear):
milky, milklike
WordNet sense 2 (not clear; not transmitting or reflecting light or radiant energy):
opaque
WordNet sense 3 (of something having a color tending toward white):
off-white
WordNet sense 4 (having no hue):
achromatic
From the ODE community, based on WordNet
add/edit