'however frustrating' is a valid expression to use in written English.
To use it, the phrase is inserted into a sentence to mean that despite being challenging or irritating, someone is still determined to achieve a goal. For example: "The project has been difficult, however frustrating, and I'm determined to finish it."
It brings families together – however frustrating that might be.
However frustrating it may seem, we can't invent laws retrospectively to snare our chosen villains.
Published to coincide with President Hu Jintao's visit to Washington, it argues that America must continue to engage with China, however frustrating the process.
Still, however frustrating the delay in the I.R.S. form may be, there may be good reason to wait before just going ahead and filing an estate tax return.
However frustrating her narrow range, the gags are still expertly put together, and Millican's demeanour – all salacious glee at these indiscreet confidences, and bemusement at her midlife indignities – is guaranteed to elicit laughs.
However frustrating their approaches may be, Merkel and Obama represent a new kind of Atlantic community, bound together more by hard economic interests than by the visions of past eras.
However frustrated a wrong thing to do and the ICC have done right thing today.
Half-time: Rich entertainment from two offensively-minded sides who have, however, frustrated with their inability to finish.
The Maoists, however, frustrated at their inability to control the army and rule the country, quit government last May, leading to the present stalemate.
Over the years, Mr. Karzai has been able to use America's commitment to Afghanistan to his own advantage: However frustrated the Americans were with Mr. Karzai, he could be sure the Americans wouldn't walk away.
Israel is also well aware that however frustrated the United States and Western Europe may be over Mr. Arafat's failure to rein in Palestinian terrorists, they still consider him the Palestinians' legitimate leader.
