Sentence:  They answered him in monosyllables , nods , occasionally muttering in Greek to one another , awaiting the word from Papa , who restlessly cracked his knuckles , anxious to stuff himself into his <WSD>white</WSD> Cadillac and burst off to the freeway . 
Meaning of the word marked with <WSD> tags:  being of the achromatic color of maximum lightness; having little or no hue owing to reflection of almost all incident light