challenge

an important, serious, or significant challenge

a challenge that requires careful consideration or action

a very large challenge

a challenge of great importance or scale

a challenge of great size or scale

a challenge not previously faced

an important or noteworthy challenge

the principal or chief challenge

an extremely large challenge

the most important challenge

a challenge that is hard to accomplish or overcome

a genuine and significant challenge

a challenge that is difficult to endure or accomplish

a challenge that will be faced in the future

a challenge affecting the entire world

a significant or substantial challenge

a challenge related to the economy

a challenge made with earnest intent and significance

a challenge related to the environment

a challenge that is still in progress

a challenge related to politics

a challenge that seems difficult to deal with in anticipation; intimidating

the first or main challenge

a challenge unlike any other

a powerful or forceful challenge

a challenge that occurs continuously over a period of time

a challenge made openly and without ambiguity

the final and most significant challenge

an ongoing challenge that has not stopped

a challenge related to technical skills or machinery

a challenge that inspires fear or respect through being impressively large, powerful, intense, or capable

a challenge that is distinct or particular

a new and different challenge

a challenge related to technology

a basic and central challenge

a challenge that is stimulating and interesting

a challenge that tests physical strength or endurance

a challenge to a decision or action in a court of law

a challenge of great size, importance, or difficulty

a challenge that arouses curiosity or interest

a difficult or severe challenge

a challenge that stimulates the mind

an attempt to replace the current leader of a political party

a challenge that has never happened or existed before

a challenge related to logistics and organization

a fundamental and far-reaching challenge

a challenge related to engineering

a successful challenge that produces a desired result

an attempt to win a championship title from the current holder

a legal challenge based on constitutional law

to challenge in a significant or earnest way

to challenge with a successful outcome

to challenge without intermediary

to challenge in a way that produces the intended result

to challenge in a public and unconcealed way

to challenge all the time or often

to challenge in front of other people

to challenge repeatedly or frequently

to challenge again and again

to challenge with great energy and force

to challenge without success

indicates the target of the challenge

indicates the source of the challenge

the main difficulty of a situation is a particular thing

a challenge that someone has to deal with

a challenge begins to exist

a challenge that someone has to face

a challenge is real or present

to serve as a challenge

to have to deal with a difficult situation

to accept and begin to deal with a challenge

to deal with a challenge in a satisfactory way

to think about and begin to deal with a challenge

to be the cause of a challenge

to make a determined effort to deal with a challenge

to present or constitute a problem or difficulty

to show that one can deal with a difficult situation successfully

to succeed in dealing with a challenge

to amount to or present itself as a challenge

to accept a challenge that is offered

to accept a challenge that is offered

to face and deal with a challenge directly

to agree to take part in a challenge

to bring a challenge into existence

to react to a challenge by taking action

to give or offer a challenge

to continue to be a challenge

to provide or present a challenge

to be glad to have a challenging situation

to find pleasure in a challenging situation

to manage a challenge successfully

to organize and begin a challenge

to mention something for people to discuss or somebody to deal with

to be or be equivalent to a challenge (formal)

to enjoy a challenging situation greatly

to continue to exist despite a challenge

to formally offer a challenge to someone

to find a solution to a challenge

to be strong enough not to be harmed or destroyed by a challenge

to resist a challenge with effort

to respond to or defend against a challenge

to successfully resist a challenge

to officially submit a legal challenge

to invite someone to a contest or competition

to compete for a position or title

to question someone about a particular topic or view

to try or attempt to challenge