"endless challenges" is a correct and usable phrase in written English.
It is typically used to describe a situation or circumstance that presents continual difficulties or obstacles. Example: "As an entrepreneur, I have faced endless challenges in building my business, but each one has only made me stronger and more determined to succeed."
With endless challenges, the process is going much more slowly than it usually does.
It appears that the Gore campaign is attempting to unduly prolong the country's national presidential election through endless challenges to the results of the vote here in Florida.
They concluded that it probably could -- but only if Democrats were persuaded that their seemingly endless challenges to the system were slowly but surely eroding confidence in it.
Those ideals clash with the unresolved multicultural reality of modern France (the racially divided French World Cup soccer team, which fell apart during the opening round, became a national case in point), complicating endless challenges like the Corsican independence movement.
His essential message reflected one of the key strands of his political theology: the mercurial magic of modern capitalism, and his mission to toughen up the country in response to the endless challenges of the free market.
For anyone who cares about creating new knowledge and conveying the knowledge we have to the next generation, as well as being engaged in the seemingly endless challenges facing our global society, there is no better place to be than here at Columbia.
Life has become a seemingly endless challenge.
Hotels, he says, are an endless challenge.
"It's an endless challenge against your own brain," Wurz said.
If there is one thing you learn from visiting farms, it's that sustainable farming is an endless challenge.
Isolated sentences heard through the crowd, hints of love, hatred, petulance, envy, rise and die like an endless challenge to one's imagination.
