challenge

As a verb challenge

is .

As an adjective challengeable is

able to be challenged or disputed.

As verbs the difference between challenge and stereotype

is that challenge is while stereotype is .

As verbs the difference between challenge and overturn

is that challenge is while overturn is to turn over, capsize or upset (something).

As verbs the difference between disillusion and challenge

is that disillusion is to free or deprive of illusion; to disenchant while challenge is .

As a noun disillusion

is (countable) the act or process of disenchanting or freeing from a false belief.

As a noun conundrum

is a difficult question or riddle, especially one using a play on words in the answer.

As a verb challenge is

.

As nouns the difference between undercut and challenge

is that undercut is a cut made in the lower part of something; the material so removed while challenge is a confrontation; a dare.

As verbs the difference between undercut and challenge

is that undercut is to sell (something) at a lower price, or to work for lower wages, than a competitor while challenge is to invite someone to take part in a competition.

As verbs the difference between refute and challenge

is that refute is to prove (something) to be false or incorrect while challenge is to invite someone to take part in a competition.

As a noun challenge is

a confrontation; a dare.

As a verb challenge

is .

As a noun burden is

.

As a verb challenge

is .

As an adjective rigorous is

manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.

As a verb challenge

is .

As a noun achievements is

.