Formal exchange-rate targets seem infeasible, even if some co-ordination between the world's major currencies might be desirable.

ECONOMIST: The international euro | The

The Obama Administration has never made clear why it thought that capturing Awlaki and bringing him to trial was infeasible.

NEWYORKER: Remote Control

Therefore, what Nolan asks that billionaires do: give away more of their capital, and give it away faster, is often an infeasible request.

FORBES: Yes, Gawker, 'The Good Rich' Do Exist

But a drug that simply blocks TGF-beta seemed infeasible.

FORBES: Scar Wars

So Japanese firms are caught in a vicious circle: because they are not selling to poor countries, their volume stays low, which keeps prices high, which makes selling to poor countries infeasible.

ECONOMIST: Why Japan lost the mobile-phone wars

Portable frontal lobe zappers are still (thankfully) infeasible.

WSJ: Mind & Matter: Alison Gopnik on Beating the Brain's Curbs on Innovation

And on the other side of the ledger, as Rosanne Altshuler, Katie Lim, and I showed in a 2010 paper, tax increases big enough to tame fiscal deficits by themselves are probably both politically infeasible and economically unwise.

FORBES: Connect

And I think it would be very odd if you said the only people you can have as governors of the BBC are people who've never before been a member of a political party, I think it would be infeasible to do that.

BBC: Forum: BBC chairman Gavyn Davies