Akademik

challenging
adjective
1. requiring full use of your abilities or resources (Freq. 3)
-

ambitious schedule

-

performed the most challenging task without a mistake

Syn: ↑ambitious
Similar to: ↑difficult, ↑hard
Derivationally related forms: ↑ambition (for: ↑ambitious)
2. stimulating interest or thought
-

a challenging hypothesis

-

a thought-provoking book

Syn: ↑thought-provoking
Similar to: ↑stimulating
3. disturbingly provocative
-

an intriguing smile

Syn: ↑intriguing
Similar to: ↑provocative

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challenging
see after challenge v.

Useful english dictionary. 2012.