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dicey

[dahy-see]
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adjective, dic·i·er, dic·i·est. Informal.
  1. unpredictable; risky; uncertain.

Origin of dicey

First recorded in 1935–40; dice + -ey1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for dicey

dicey

adjective dicier or diciest informal, mainly British
  1. difficult or dangerous; risky; tricky
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

Word Origin and History for dicey

adj.

"risky, uncertain" (as the roll of dice), 1940s, aviators' jargon, from dice (n.) + -y (2). Related: Diciness.

Online Etymology Dictionary, © 2010 Douglas Harper