Noun : Space exploration offers a challenge to humankind. ,a challenge to the treasurer to itemize expenditures.    From Dictionary.com. 

Verb (used with object) : to challenge the wisdom of a procedure. ,a matter which challenges attention.    From Dictionary.com. 

Adjective : a challenge grant.    From Dictionary.com. 

University College Union (UCU) branch secretary Dr Trevor Curnow said the university staff cost figures were "challengeable".    From Wordnik.com.  [News round-up] Reference

The WTO is certainly challengeable in a host of areas.    From Wordnik.com.  [CNN Transcript Sep 1, 2004] Reference

And she comes without an iota of challengeable baggage.    From Wordnik.com.  [9/11 Truth Calling Oprah!] Reference

But at least then earmarks would be challengeable on the floor.    From Wordnik.com.  [The GOP and Earmarks] Reference

Headless Chicken wrote ... well, a whole bunch, most of it challengeable.    From Wordnik.com.  [On Thursday, the Legg report will be published along with...] Reference

The procedures followed so far were challengeable in a court of law, he said.    From Wordnik.com.  [ANC Daily News Briefing] Reference

Truly, it was challengeable to organize all the staff, but a good lesson for us.    From Wordnik.com.  [My summary of the year] Reference

If that statement is challengeable, what he says next can be taken as normal and even helpful.    From Wordnik.com.  [US Must Act To Save World From Further Destruction] Reference

The lesson was that Mao's authority was un challengeable even though he was clearly in the wrong.    From Wordnik.com.  [WILD SWANS THREE DAUGHTERS OF CHINA]

Good work, but with some challengeable content; your effort and passion really shows on your site.    From Wordnik.com.  [Think Progress » Pentagon Response to Katrina Based on Nonexistent “Dodged a Bullet” Headline] Reference

If it's an illegal act, I don't see that it should necessarily be something that would be challengeable.    From Wordnik.com.  [CNN Transcript Jul 11, 2006] Reference

He said the second challengeable perspective was that for black business to survive the workers had to suffer.    From Wordnik.com.  [ANC Daily News Briefing] Reference

They were more powerful and less constitutionally challengeable than the Civil Rights legislation that has been enacted since the 1960s.    From Wordnik.com.  [The Volokh Conspiracy » Is “The Constitution in Exile” A Myth?:] Reference

"It was clear that ... in its totality, it challenged civilian control, which is a fundamental principle for us that is not challengeable.".    From Wordnik.com.  [Obama says he is 'confident' in war leadership] Reference

And, on the whole, we converse, and are challengeable.    From Wordnik.com.  [Slugger O'Toole] Reference

"This is not challengeable by the defendant," McCarty said.    From Wordnik.com.  [Local News from Spartanburg Herald Journal] Reference

"A wide margin implies less risk of a challengeable result,".    From Wordnik.com.  [Bloomberg] Reference

I see several challengeable statements in just this little sound bite article.    From Wordnik.com.  [NewWest.Net All Headlines] Reference

The guys on the field didn't seem to think it was a challengeable play, so we didn't.    From Wordnik.com.  [The Seattle Times] Reference

"They are admitting their position is at least in question and at least challengeable,".    From Wordnik.com.  [JSOnline.com] Reference

Unfortunately for us, DPI - defensive pass interference -- is not a challengeable call.    From Wordnik.com.  [Colts.com Football News] Reference

"The question still has to be determined of what is challengeable from a legal perspective,".    From Wordnik.com.  [KSAT.com - Local News] Reference

In an interview with Al-Ahram on August 12, the pontiff insisted that Mubarak was un-challengeable.    From Wordnik.com. Reference

Since the game, I found out it was a potentially challengeable play; we didn't deem it to be one.    From Wordnik.com.  [The Seattle Times] Reference

"Closing those gaps would create a level of certainty that is far less challengeable," said Dr Kennel.    From Wordnik.com.  [RealClimate] Reference

He said his group's lawyers will examine the new plan and "challenge what we believe is challengeable.".    From Wordnik.com.  [Crain's New York Business - Breaking News Feeds] Reference

So there it is - the not so shadowy pal of the "real" un-challengeable government of the Federal Reserve.    From Wordnik.com.  [Latest Articles] Reference

By using what supporters say in football stadiums as evidence of collective racism is highly challengeable.    From Wordnik.com.  [The Jakarta Post Breaking News] Reference

In its totality, it challenged civilian control, which is a fundamental principle for us that is not challengeable.    From Wordnik.com.  [NYT > Home Page] Reference

It was close enough to do so, but the whole issue is moot, because that's a judgment issue and is non-challengeable.    From Wordnik.com.  [Colts.com Football News] Reference

At bottom, Fish assumes that questions of value are utterly distinct from questions of fact-a highly challengeable position.    From Wordnik.com.  [City Journal] Reference

Interestingly for that Political Administration any verdict is not challengeable even in Supreme and High Courts of Pakistan.    From Wordnik.com.  [Countercurrents.org] Reference

"There are elements in that legislation that are challengeable in court," said Patrick Coppens, secretary general of EBF and ERNA.    From Wordnik.com.  [NutraIngredients RSS] Reference

But that's no excuse.), I will cite only three facts that will hopefully not fall into the challengeable column.    From Wordnik.com.  [All is "Lost"] Reference

Even that may be challengeable, however.    From Wordnik.com.  [CNN Transcript Mar 10, 2007] Reference

Because it's not challengeable according toyou, the agreement itself. ".    From Wordnik.com.  [Law.com - Newswire] Reference

But I think that's challengeable too.    From Wordnik.com.  [SeekingAlpha.com: Home Page] Reference

28. challengeable.    From Wordnik.com.  [A Spelling-Book for Advanced Classes] Reference