plain suggests outspokenness and freedom from affectation or subtlety in expression.

She wore a plain black dress. We've chosen a plain carpet (= one without a pattern) and patterned curtains. He prefers plain food - nothing too fancy. We're having plain blue walls in the dining room.

1. Free from obstructions; open; clear: in plain view. 2. Obvious to the perception or mind; evident: make one's intention plain. See Synonyms at apparent. 3. a. Not elaborate or complicated; simple: plain food.

PLAIN definition: clear or distinct to the eye or ear: to stand in plain view. See examples of plain used in a sentence.

ordinary, simple, or unostentatious: Although she was a duchess, her manners were attractively plain. with little or no embellishment, decoration, or enhancing elaboration: a plain blue suit.

1 day ago · plain (third-person singular simple present plains, present participle plaining, simple past and past participle plained) (obsolete, transitive) To level; to raze; to make plain or even on the surface.

In geography, a plain, commonly known as flatland, is a flat expanse of land with a layer of grass that generally does not change much in elevation, and is primarily treeless.