Describes a plain, unembellished style or atmosphere, often with a positive connotation of understated elegance. Used for writing, speech, design, or demeanor.
His writing is simple and easy to read.
I like the quiet, unadorned atmosphere of this room.
Composed of 平 (flat, even, calm) and 淡 (pale, light, fleeting). The combination conveys a sense of even, unexaggerated plainness.