Whitishness refers to the quality or state of being somewhat white or having a pale color. When describing a color that is similar to whitishness, one may use synonyms such as pallidity, paleness, lightness, pastiness, or faintness. Another way to describe something that has a white or pale color is to use adjectives like milky, ivory, pearl, or alabaster. In some cases, one may also use terms such as wan, washed-out, or ashen to convey the idea of whitishness. Overall, there are plenty of synonyms available to describe the quality of being somewhat white or pale, depending on the context and the level of precision needed.