WordWeb Online

1. The state of being unmixed with other material
   "the plainness of vanilla ice cream"
    
2. Clarity as a consequence of being perspicuous
   - perspicuity, perspicuousness
    
3. The appearance of being plain and unpretentious
    
4. An appearance that is not attractive or beautiful
   "fine clothes could not conceal the girl's plainness"
   - homeliness

Derived forms: plainnesses

See also: plain

Type of: appearance, clarity, clearness, limpidity, lucidity, lucidness, pellucidity, pureness, purity, visual aspect