unadorned

adj

1. Having no additional decoration or embellishment; plain and simple

   “Her clothes were unadorned, yet her beauty was undiminished.”

   “This was the era of the polykatoikia, the apartment block built of unadorned concrete and typically five or six storeys high.”

   “Though I wore only a plain somber gray Brunswick gown unadorned by ribbon or lace, and my uncle was dressed in black, the people knew aristocrats on sight.”

verb

1. (form-of, participle, past)simple past and past participle of unadorn