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challenging

[chal-in-jing] /ˈtʃæl ɪn dʒɪŋ/
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.
Origin
1300-1350
1300-50; Middle English, as gerund; 1835-45 for def 1; see challenge, -ing2
Related forms
challengingly, adverb
nonchallenging, adjective
unchallenging, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un challenging

challenging

/ˈtʃælɪndʒɪŋ/
adjective
1.
demanding or stimulating: a challenging new job
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
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