intriguing

(verb) cause to be interested or curious. Synonyms: intrigue, fascinate.

(verb) form intrigues (for) in an underhand manner. Synonyms: scheme, intrigue, connive.

(adj) disturbingly provocative. Synonyms: challenging. Example: "An intriguing smile."

(adj) capable of arousing interest or curiosity. Example: "Our team came up with some most intriguing finds."