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"
Related Information
Related Terms
alluring, arrogant, audacious, bold, brash, brassy, brazen, bumptious, cheeky, cocky, contemptuous, daring, defiant, defying, derisive, disdainful, disregardful, encouraging, energizing, exciting, galvanic, galvanizing, greatly daring, impertinent, impude