plain
adjectiveUK /pleɪn/
US /pleɪn/
Something plain is simple and has no extra decoration.
She wore a plain white shirt with no pictures on it.
OTHER MEANINGS
2. Easy to see or understand; clear.
It was plain that he was tired.
3. A large flat area of land with few trees.
Buffalo roamed across the wide plain.
4. Not pretty or fancy in appearance.
He thought the building looked plain and boring.