[化] 平坦度

1. the state of being unmixed with other material

<noun.state>
the plainness of vanilla ice cream

2. clarity as a consequence of being perspicuous

<noun.attribute>

3. the appearance of being plain and unpretentious

<noun.attribute>

4. an appearance that is not attractive or beautiful

<noun.attribute>
fine clothes could not conceal the girl's homeliness