noun

plainness

plainness, simplicity, frankness, unadornment

The plainness of the room was calming.

The plainness of the room was calming.

She spoke with surprising plainness.

She spoke with surprising plainness.

the plainness of ((sth.)) the quality of being simple and unadorned The plainness of the design is its best feature.

Synonyms: simplicity, frankness; Antonyms: ornateness, complexity

From the adjective 'plain' (simple, unadorned) plus the suffix '-ness', which forms nouns indicating a state or quality.

Think of a 'plain' t-shirt. Its 'plainness' is its lack of decoration and simplicity.

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