challenging
adj. · n.-
1 difficult but rewarding (adj.) B2 Upper Intermediatedifficult in a way that tests your ability or determination.
demanding considerable effort, skill, or endurance, often with the implication of being stimulating or worthwhile.
ExampleThe hike was challenging because the path was very steep and rocky.
ExampleThe board of directors faced a challenging fiscal year, requiring them to restructure the entire department while maintaining employee morale.
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2 the act of testing (n.) C1 Advanced Formalthe act of questioning something or testing someone's skills.
the action of disputing a statement or testing the boundaries of a rule or ability.
ExampleHis challenging of the referee's decision led to a long argument on the field.
ExampleThe legal team's persistent challenging of the evidence eventually forced the prosecution to drop the most serious charges.
From Middle English chalengynge; equivalent to challenge + -ing.