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challenging

[chal-in-jing]
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adjective
  1. offering a challenge; testing one's ability, endurance, etc: a challenging course; a challenging game.
  2. stimulating, interesting, and thought-provoking: a challenging suggestion.
  3. provocative; intriguing: a challenging smile.
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Origin of challenging

1300–50; Middle English, as gerund; 1835–45 for def 1; see challenge, -ing2
Related formschal·leng·ing·ly, adverbnon·chal·leng·ing, adjectiveun·chal·leng·ing, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for un-challenging

challenging

adjective
  1. demanding or stimulatinga challenging new job
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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