adj: requiring full use of your abilities or resources; "ambitious schedule"; "performed the most challenging task without a mistake"
adj: stimulating interest or thought; "a challenging hypothesis"; "a thought-provoking book"
adj: disturbingly provocative; "an intriguing smile"
Length: 11 letters
Scrabble value: 18
Words with Friends value: 24
Literati value: 12
TWL (USA): Found
SOWPODS (UK): Found
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