Definitions for: Challenging

[adj] requiring full use of your abilities or resources; "ambitious schedule"; "performed the most challenging task without a mistake"
[adj] disturbingly provocative; "an intriguing smile"
[adj] stimulating interest or thought; "a challenging hypothesis"; "a thought-provoking book"

Synonyms: ambitious, difficult, hard, intriguing, provocative, stimulating, thought-provoking

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