pale: implies relative nearness to white and deficiency in depth and brilliance of color:  Her dress was a very ~ rose.


pallid: suggest deprivation of natural color and connotes abnormality: his ~ face reveals the stain he is under.


ashen, ashy: implies a pale, grayish color suggestive of ashes and stresses an unwholesome and portentous pallor: the ~(ashen) sky of a winter afternoon; hoping for color to return to his ~(ashy) face.


wan: suggests blanched appearance associated with waning vitality and is likely to denote a sickly paleness: the ~ paleness of a fading moon.


livid: basically means leaden-hued, and is used of things that have lost their normal coloring and assumed a dull grayish tinge: the ~ red of the sun through the fog.


pale: 接近白色,没有深度亮度,pallid指不自然反常, ashen,ashy灰白像灰尘(ashes)不健康不祥，wan活力丧失病态，livid铅色，失去原有颜色-->灰白沉闷。

记忆方法: 1）苍白的意思是缺乏自然健康的颜色或具有活力的色彩mean deficient in natural or healthy color or in vividness or intensity of hue.