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• v  take exception to
• v  issue a challenge to
• v  ask for identification
• v  raise a formal objection in a court of law
• s  requiring full use of your abilities or resources
  performed the most challenging task without a mistake
• s  stimulating interest or thought
  a challenging hypothesis
• s  disturbingly provocative

• Roman Catholicism's Christoph Cardinal Schnborn has dubbed the most fervent of faith-challenging scientists followers of "scientism" or "evolutionism," since they hope science .
• High-wired Mountain Act High-altitude climbing is a challenging spectator sport, but thanks to technology it's gaining popularity.
• And back home, people are starting to recognize that a voice capable of challenging authority is invaluable.

• challenge
• dispute
• gainsay
• take exception
• ambitious
• thought-provoking
• intriguing

News & Articles

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• IEA Sees Natural Gas Challenging Oil's Transport Fuel Dominance
  IEA Sees Natural Gas Challenging Oil's Transport Fuel Dominance
  June 20, 2013 - Nasdaq
• West doesn’t rule out challenging Rubio
  West doesn’t rule out challenging RubioSaying he has “a lot of concerns” about the immigration reform bill backed by Sen.
  June 19, 2013 - The Palm Beach Post
• Climate activists launch petition challenging WBAL-TV, Tony Pann
  Two climate change advocacy groups are challenging WBAL-TV and Tony Pann, one of the station's meteorologists, for Pann's stance denying that global warming is occurring.        
  June 18, 2013 - Baltimore Sun

Quotes

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• Barack Obama in International Herald Tribune
  In these challenging times, when we are facing both rising deficits and a sinking economy, budget reform is not an option,Obama said. "It's a necessity."
• Michael Mukasey in International Herald Tribune
  I'm disappointed with the decision, in so far as I understand that it will result in hundreds of actions challenging the detention of enemy combatants to be moved to federal district court,Mukasey said at a Group of Eight meeting of justice...
• Hillary Rodham Clinton in Bloomberg
  This is going to be a challenging time,Clinton said. "And it will require 21st-century tools and solutions to meet our problems and seize our opportunities."