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plain-vanilla

[pleyn-vuh-nil-uh]
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adjective Informal.
  1. having no embellishments, extra equipment, elaborate packaging, etc.; plain; simple; down-to-earth: I want a plain-vanilla car without a lot of chrome trim.

Origin of plain-vanilla

in allusion to vanilla ice cream, taken to be the most basic flavor
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018