Definitions for "challenging"
disturbingly provocative; "an intriguing smile"
requiring full use of one's abilities or resources; as, challenging task.
requiring full use of your abilities or resources; "ambitious schedule"; "performed the most challenging task without a mistake"
disposed to or engaged in defiance of established authority.
when a player challenges their opponent. The most direct way to challenge is to tackle, however it is not always the best. Intercepting a pass is the best way of challenging but leaves the defender in a bad position to recover if they are not successful. See also Challenge.
stimulating interest or thought; "a challenging hypothesis"; "a thought-provoking book"
Keywords:  difficult, interesting
interesting; difficult.