challenging

  • (s) requiring full use of your abilities or resources
    • ambitious schedule
    • performed the most challenging task without a mistake
    ambitious,
  • (s) stimulating interest or thought
    • a challenging hypothesis
    • a thought-provoking book
    thought-provoking,
  • (s) disturbingly provocative
    • an intriguing smile
    intriguing,

Synonyms

ambitious thought-provoking intriguing

Words of close approximity