requiring full use of your abilities or resources; "ambitious schedule"; "performed the most challenging task without a mistake"
disturbingly provocative; "an intriguing smile"
stimulating interest or thought; "a challenging hypothesis"; "a thought-provoking book"
raise a formal objection in a court of law
ask for identification; "The illegal immigrant was challenged by the border guard"
issue a challenge to; "Fischer challenged Spassky to a match"
take exception to; "She challenged his claims"
not easily borne; wearing; "the burdensome task of preparing the income tax return"; "my duties weren't onerous; I only had to greet the guests"; "a taxing schedule"
causing fear or anxiety by threatening great harm;
very bad in degree or extent;
unsparing and uncompromising in discipline or judgment;
intensely or extremely bad or unpleasant in degree or quality;
very strong or vigorous;
severe and unremitting in making demands; "an exacting instructor"; "a stern disciplinarian"; "strict standards"
of a stern or strict bearing or demeanor; forbidding in aspect; "an austere expression"; "a stern face"
the rear part of a ship
not to be placated or appeased or moved by entreaty; "grim determination"; "grim necessity"; "Russia's final hour, it seemed, approached with inexorable certainty"; "relentless persecution"; "the stern demands of parenthood"
the fleshy part of the human body that you sit on; "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing?"
United States concert violinist (born in Russia in 1920)