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underproof

[uhn-der-proof]
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adjective
  1. containing a smaller proportion of alcohol than proof spirit.
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Origin of underproof

First recorded in 1855–60; under- + proof
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for underproof

underproof

adjective
  1. (of a spirit) containing less than 57.1 per cent alcohol by volume
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012