Adjective : a passable knowledge of French. ,passable legislation.    From Dictionary.com. 

"When this board is under water the river is unpassable.".    From Wordnik.com.  [The New Pun Book] Reference

We also have a lot of side roads that are still unpassable.    From Wordnik.com.  [CNN Transcript Dec 29, 2006] Reference

The absence of passages are not evidence that it was unpassable.    From Wordnik.com.  [Hansen Step 2 – First Thoughts « Climate Audit] Reference

Then we can talk about Marshall Plans for mountain towns with unpassable roads.    From Wordnik.com.  [Let's Not Give Peace A Chance-Yet] Reference

Bonsel (ph) and the 82nd Airborne guided us in on roads unpassable just yesterday.    From Wordnik.com.  [CNN Transcript Sep 27, 2005] Reference

All roads leading out of our region were blocked, and many interior roads were unpassable.    From Wordnik.com.  [Lessons Learned From a Power Outage | Thingamababy] Reference

I was away from my native country, at a distance prodigious, and the return to me unpassable.    From Wordnik.com.  [Moll Flanders] Reference

When they are finished and defended by an army of moderate size, they will be quite unpassable.    From Wordnik.com.  [Beyond the Sunrise]

Bill Clinton signed the Kyoto Treaty which he knew to be unpassable by the Senate as a political ploy.    From Wordnik.com.  [Rejected realclimate Posts « Climate Audit] Reference

The path eventually turned into a morass of mud and unpassable areas so we backtracked to the bike trail.    From Wordnik.com.  [HIKING: Sunday Hike At Nimbus Hatchery (23 April 2006)!] Reference

I'm going to try and see it in a few weeks but depends if the rain makes the path unto the ranch unpassable.    From Wordnik.com.  [Cold snap, dining at St John, tourist Nigeria and an Adichie update] Reference

But he didn't mention that many of the roads are still unpassable in that country because of bandit and warlord rule.    From Wordnik.com.  [Our New Civil War] Reference

And, with all the trees down, and the limbs down, and the roads unpassable, it's hard for the relief crews to get through.    From Wordnik.com.  [CNN Transcript Oct 13, 2006] Reference

So congressional leaders decide to debate unpassable constitutional amendments barring flag-burning and same-sex marriage.    From Wordnik.com.  [John Sweeney: If You���re Not Outraged, You���re Not Paying Attention] Reference

Fires spread across the city, even as roadways deemed unpassable by fallen debris prevented rescuers from reaching victims.    From Wordnik.com.  [CNN Transcript - Special Event: Millennium 2000: Natural Disasters - January 2, 2000] Reference

The desire for children, and the fact that my body was totally unpassable, were the two pillars that had kept my GID at bay.    From Wordnik.com.  [Not Funny] Reference

I walked around, passing him within maybe six inches because of the unpassable cacti and underbrush on both sides of the trail.    From Wordnik.com.  [When in the Desert, Don’t Forget Water…or to Look Down « Looking for Roots] Reference

Many city streets and neighborhoods became nearly unpassable then as the city refused to salt roads and didn't have enough snow plows.    From Wordnik.com.  [Clouds Over Seattle Mayor's Election Bid] Reference

And basically now if you don't leave at a certain point, it becomes unpassable for either firefighters getting in or residents leaving.    From Wordnik.com.  [CNN Transcript Aug 31, 2009] Reference

Pembrokeshire port because the roads were unpassable.    From Wordnik.com.  [WalesOnline - Home] Reference

It's a zone which is completely unpassable when it rains.    From Wordnik.com.  [Democracy Now!] Reference

It was a place among rocks, very steep, and unpassable for water.    From Wordnik.com.  [The suppressed Gospels and Epistles of the original New Testament of Jesus the Christ, Volume 9, Hermas] Reference

And so they came to the swart arboreal precipice of the unpassable forest.    From Wordnik.com.  [The Book of Wonder] Reference

"This is pretty serious right now; many of the back roads are unpassable.".    From Wordnik.com.  [Brattleboro Reformer Most Emailed] Reference

This showboating presentation of an unpassable law suggests something to me.    From Wordnik.com.  [Pharyngula] Reference

Baleinaga, Wailotua and Nayavu and roads underwater and unpassable include the Kings Road.    From Wordnik.com.  [Fijilive.com - Gateway to Fiji Islands - News] Reference

Mr. Holyoke dined with us, who is still kept here by the snow that makes the ways unpassable.    From Wordnik.com.  [Collections of the Massachusetts Historical Society] Reference

Rural areas across the region found themselves virtually snowed in as roads became unpassable.    From Wordnik.com.  [The Independent - Frontpage RSS Feed] Reference

The way is intricate, deep, unpassable, that leads to that satisfaction you desire to your lusts.    From Wordnik.com.  [The Works of the Rev. Hugh Binning] Reference

How much more dignified leisure hath a mussel glued to his unpassable rocky limit, two inch square!.    From Wordnik.com.  [The Works of Charles and Mary Lamb — Volume 5 The Letters of Charles and Mary Lamb] Reference

Before the Snowpocalypse coated the roads with unpassable gray mush, she was still riding in the cold.    From Wordnik.com.  [Phillyist] Reference

At any given moment there are numerous points in the city that are just flooded, while others are denominated "unpassable.".    From Wordnik.com.  [Home] Reference

On the first count, you'd probably need to show that either there was a clear quid pro quo or that the dissertation was unpassable.    From Wordnik.com.  [Ask MetaFilter] Reference