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Meaning of plain Jane

plain' Jane'

Pronunciation: [key]
— Informal. Informal.
  1. a drab, unattractive, and generally uninteresting girl or woman.

plain-Jane

Pronunciation: (plān'jān'), [key]
— adj. Informal.
  1. simple and modest; unadorned; basic: a plain-Jane car dressed up with leather upholstery.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.