Challenging (Adjective)
Meaning 1
Stimulating interest or thought; "a challenging hypothesis"; "a thought-provoking book".
Classification
All adjective clusters.
Synonyms
Meaning 2
Requiring full use of your abilities or resources; "ambitious schedule"; "performed the most challenging task without a mistake".
Classification
All adjective clusters.
Synonyms
Meaning 3
Disturbingly provocative; "an intriguing smile".
Classification
All adjective clusters.