- 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)
- challenge, dispute, gainsay - take exception to; "She challenged his claims"
--1 is one way to contest, contend, repugn
Sample sentences:Derived form: noun challenge3
Somebody ----s something
Somebody ----s somebody
- challenge - issue a challenge to; "Fischer challenged Spassky to a match"
--2 is one way to invite, bid
Sample sentence:Derived forms: noun challenger1, noun challenge2
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
Sample sentence:Derived form: noun challenge5
Somebody ----s somebody
- challenge, take exception - raise a formal objection in a court of law
--4 is one way to object
Sample sentence:Derived form: noun challenge4
Somebody ----s PP