challenging - definition, thesaurus and related words from WordNet-Online

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Adjective challenging has 3 senses

ambitious, challenging - requiring full use of your abilities or resources; "ambitious schedule"; "performed the most challenging task without a mistake"
Antonym: easy (indirect, via difficult)
challenging, thought-provoking - stimulating interest or thought; "a challenging hypothesis"; "a thought-provoking book"
Antonyms: unstimulating, unexciting (indirect, via stimulating)
challenging, intriguing - disturbingly provocative; "an intriguing smile"
Antonyms: unprovocative, unprovoking (indirect, via provocative)

Verb challenge has 4 senses

challenge, dispute, gainsay - take exception to; "She challenged his claims"
--₁ is one way to contest, contend, repugn

Derived form: noun challenge₃
Sample sentences:
Somebody ----s something
Somebody ----s somebody
challenge - issue a challenge to; "Fischer challenged Spassky to a match"
--₂ is one way to invite, bid

Derived forms: noun challenger₁, noun challenge₂
Sample sentence:
They challenge him to write the letter
challenge - ask for identification; "The illegal immigrant was challenged by the border guard"
--₃ is one way to request, bespeak, call for, quest

Derived form: noun challenge₅
Sample sentence:
Somebody ----s somebody
challenge, take exception - raise a formal objection in a court of law
--₄ is one way to object

Derived form: noun challenge₄
Sample sentence:
Somebody ----s PP