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Plain

/pleɪn/

Simple in design without much decoration or extra features

Synonyms:

A broad plain spreads before us.

Your speaking countenance,' said Wegg, 'puts it plainer than language.

I crossed flat plains and high mountains.

The word plain comes from the Old French plain or Latin planus, which means flat, level, even, used in both physical and metaphorical senses.

21 mentions per 1 million words

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Hint: Frequency according to COCA