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The definition of plain

15 Definitions of: plain

1. adjective, flat or smooth; level
2. adjective, not complicated; clear
3. adjective, not difficult; simple or easy
4. adjective, honest or straightforward
5. adjective, lowly, esp in social rank or education
6. adjective, without adornment or show
7. adjective, (of fabric) without pattern or of simple untwilled weave
8. adjective, not attractive
9. adjective, not mixed; simple
10. adjective, knitting of or done in plain
11. noun, a level or almost level tract of country, esp an extensive treeless region
12. noun, a simple stitch in knitting made by putting the right needle into a loop on the left needle, passing the wool round the right needle, and pulling it through the loop, thus forming a new loop
13. noun, a) the unmarked white ball, as distinguished from the spot balls b) the player using this ball
14. noun, (in Ireland) short for plain porter
15. adverb, (intensifier) ▷ See also plains
16. Show me some examples of this word: plain
17. Show me the etymology of the word: plain
1. verb, a dialect or poetic word for complain
2. Show me some examples of this word: plain
3. Show me the etymology of the word: plain

Synonyms:	open, bare, honest, plateau, prairie, grassland, mesa, lowland, steppe, pampas	And more...
Antonyms:	ornate, hidden, roundabout, attractive	And more...

From Collins