challenging

Adjective
  1. Requiring full use of your abilities or resources (synset 300749254)
    "ambitious schedule"; "performed the most challenging task without a mistake"
    similar to: difficult, hard - not easy; requiring great physical or mental effort to accomplish or comprehend or endure
    same as: ambitious
  2. Stimulating interest or thought (synset 302314278)
    "a challenging hypothesis"; "a thought-provoking book"
    similar to: stimulating - rousing or quickening activity or the senses
    same as: thought-provoking
  3. Disturbingly provocative (synset 301903173)
    "an intriguing smile"
    similar to: provocative - serving or tending to provoke, excite, or stimulate; stimulating discussion or exciting controversy
    same as: intriguing

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