English Reference
adjective · noun

challenging

adj. · n.
US /ˈtʃæɫəndʒɪŋ/ UK /tʃˈælɪndʒˌɪŋ/ chal·leng·ing

  1. 01 B2 Upper Intermediate

    adj.difficult in a way that tests your ability or determination.

    adj.demanding considerable effort, skill, or endurance, often with the implication of being stimulating or worthwhile.

    Simple

    The hike was challenging because the path was very steep and rocky.

    In context

    The board of directors faced a challenging fiscal year, requiring them to restructure the entire department while maintaining employee morale.

  2. 02 C1 Advanced Formal

    n.the act of questioning something or testing someone's skills.

    n.the action of disputing a statement or testing the boundaries of a rule or ability.

    Simple

    His challenging of the referee's decision led to a long argument on the field.

    In context

    The legal team's persistent challenging of the evidence eventually forced the prosecution to drop the most serious charges.

Usage challenging situation

He has become more forgetful, for instance, but takes consolation in knowing he can still produce challenging, original art.

The Guardian· 15 Aug 2026

While vaccinating wild birds is challenging, it was considered possible in Victoria’s wild little penguins because they generally return to the same burrows at Phillip Island and St Kilda each night.

The Guardian· 15 Aug 2026

From Middle English chalengynge; equivalent to challenge + -ing.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Middle English chalengynge
Level B2 · Upper Intermediate
Frequency Common
Updated