Challengingadjective
Difficult, hard to do.
Challengingnoun
The act of making a challenge.
Challenging
requiring full use of one's abilities or resources; as, challenging task.
Challenging
disposed to or engaged in defiance of established authority.
Challengingadjective
requiring full use of your abilities or resources;
Challengingadjective
stimulating interest or thought;
Challengingadjective
disturbingly provocative;
Challengeableadjective
Able to be challenged or disputed.
Challengeableadjective
That may be challenged.
Challengeableadjective
capable of being challenged