Pure and complete, with nothing mixed in or taken away; authentic and not diluted.
From the prefix 'un-' (not) plus 'adulterated' (mixed with lower-quality substances). 'Adulterate' comes from Latin 'adulterare' (to corrupt). The prefix chain dates to Middle English legal and merchant language.
During the Industrial Revolution, 'adulterated' became a scandal word—like when milk dealers mixed in water or brewers added cheap ingredients. 'Unadulterated' became the gold standard claim, so it's essentially Victorian food-safety language that stuck around!
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