simple and modest; unadorned; basic: a plain-Jane car dressed up with leather upholstery.
Origin of plain-Jane
First recorded in 1935–40
a drab, unattractive, and generally uninteresting girl or woman.
Origin of plain Jane
First recorded in 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for plain-jane
Contemporary Examples of plain-jane
The Daily Pic: Fluorescent tubes as plain-Jane art supplies.Dan Flavin Enlightened Us
February 28, 2013
"unattractive woman," first attested 1912.
Online Etymology Dictionary, © 2010 Douglas Harper