Plain

1. Not luxurious; not highly seasoned; simple; as, plain food.
2. To lament; to bewail; to complain.
3. Not variegated, dyed, or figured; as, plain muslin.
4. Level land; usually, an open field or a broad stretch of land with an even surface, or a surface little varied by inequalities; as, the plain of Jordan; the American plains, or prairies.
5. To plane or level; to make plain or even on the surface.
6. Void of extraneous beauty or ornament; without conspicious embellishment; not rich; simple.
7. Without elevations or depressions; flat; level; smooth; even. See Plane.
8. Free from affectation or disguise; candid; sincere; artless; honest; frank.
9. Without beauty; not handsome; homely; as, a plain woman.
10. In a plain manner; plainly.
11. Not highly cultivated; unsophisticated; free from show or pretension; simple; natural; homely; common.
12. Open; clear; unencumbered; equal; fair.
13. To lament; to mourn over; as, to plain a loss.
14. To make plain or manifest; to explain.
15. Not intricate or difficult; evident; manifest; obvious; clear; unmistakable.
16. A field of battle.
17. Not much varied by modulations; as, a plain tune.