What is another word for "colorless"?

Roget's Thesaurus (1911) lists these synonyms for "colorless": bald, bland, careless, childish, cold, diffuse, dry, dull, feeble, feebleness, flatulent, frigid, inexact, jejune, languid, lax, loose, lukewarm, meager, monotonous, negligent, poor, prosaic, prosy, puerile, rambling, sketchy, slight, slipshod, slipslop, slovenly, tame, trashy, vapid, washy, weak.