Definitions
unmistakably (‘plain’ is often used informally for ‘plainly’)
Word origin
From Middle English pleyn, borrowed from Anglo-Norman pleyn, playn, Middle French plain, plein, and Old French plain, from Latin plānus (“flat, even, level, plain”). Doublet of llano, piano, and plane.
Used in a sentence
“The crooked shall be made straight, and the rough places plain.”
“He was dressed simply in plain black clothes.”
“a plain tune”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Simple, without decoration”5 letters
02“Simple and clear”5 letters
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