1 ADJ [usually ADJ n] 单色的；素色的；无花纹（或图案、字迹）的 A plain object, surface, or fabric is entirely in one colour and has no pattern, design, or writing on it. 单色的；素色的；无花纹（或图案、字迹）的
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In general, a plain carpet makes a room look bigger.
一般来说，单色的地毯使房间显得更宽敞。
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He placed the paper in a plain envelope.
他把论文装进一个空白信封里。
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He wore a plain blue shirt, open at the collar.
他穿一件素净的蓝色衬衫，领口敞着。
2 ADJ-GRADED 朴素的；简朴的 Something that is plain is very simple in style. 朴素的；简朴的
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Bronwen's dress was plain but it hung well on her.
布朗温的长裙虽然朴素，却很合身。
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It was a plain, grey stone house, distinguished mainly by its largely unspoilt simplicity.
这是一幢简朴的灰石房子，主要以其天然简约的风格显得与众不同。
SYN unadorned, simple, basic, severe
3 ADJ-GRADED [usually verb-link ADJ] 明显的；明白的；清楚的 If a fact, situation, or statement is plain, it is easy to recognize or understand. 明显的；明白的；清楚的
SYN clear, obvious, patent, evident
5 ADJ-GRADED （相貌）平常的，不好看的 If you describe someone as plain, you think they look ordinary and not at all beautiful. （相貌）平常的，不好看的
SYN ugly, ordinary, unattractive, homely [US , Canadian]
6 N-COUNT 平原；（几乎没有树木的）大片平地 A plain is a large flat area of land with very few trees on it. 平原；（几乎没有树木的）大片平地
SYN flatland, plateau, prairie, grassland
7 ADV [ADVERB adjective] （用于形容词前加强语气）显然，完全地 You can use plain before an adjective in order to emphasize it. （用于形容词前加强语气）显然，完全地 [emphasis]
Plain is also used before a noun.
8 ADJ [ADJ n-proper] （尤在与另一个更加不同寻常或让人印象深刻的名字比较时表示强调）普通的，平凡的 You can use plain before a name to emphasize how simple and ordinary it is, especially when you are comparing it with another more unusual or impressive name. （尤在与另一个更加不同寻常或让人印象深刻的名字比较时表示强调）普通的，平凡的 [emphasis]
9 PHRASE （警察）穿便衣的 If a police officer is in plain clothes, he or she is wearing ordinary clothes instead of a police uniform. （警察）穿便衣的
10 plain sailing→see: sailing
ThesaurusWord Partnership
| Thesaurus | plain Also look up: |
| ADJ. | bare, modest, simple; (ant.) elaborate, fancy 1 common, everyday, modest, ordinary, simple, usual; (ant.) elaborate, fancy 2 clear, distinct, evident, transparent 3 |
| Word Partnership | Use plain with: |
| N. | plain style 2 plain English, plain language, plain speech, plain truth 3 |
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