The phrase "challenging endeavour" is correct and commonly used in written English.
It can be used to describe an activity or task that is difficult or requires great effort and determination. Example: "Starting a business from scratch is a challenging endeavour, but with determination and hard work, it can lead to great success."
Investigating the early evolution of winged insects (Pterygota) is a thrilling, yet challenging, endeavour.
Cryopreservation of immature oocytes at the GV stage is also the subject for challenging endeavour.
Between managing a 30-year partnership with Bill Clinton and managing a small town, it would be rash to say which is the more challenging endeavour.
In the Caspian Sea, an international consortium is exploring the Kashagan oil and gas field, a mega-project that the consortium itself describes as an enormously challenging endeavour.
The systematic control of imported food and feed is a challenging endeavour.
The computational modelling of multiphysics mass transfer in a microchannel is a challenging endeavour.
The endeavour was challenging from the start because of the complicated ambition of including a diversity of actors, potential hotspots, concerns and assessment criteria, but nevertheless the procedure proved its value in both structuring and informing the decision-making process.
[RM, round 2] It was felt that PI needed to be embedded into the culture of organisations; not least by challenging those whose PI endeavour was suggestive of tokenistic practice.
But what's beyond debate is the enduring appeal of the daring criminal challenging the establishment with criminal endeavour.
In short it seems that Mr Wiseman may have become more interested in looking at artistic endeavour than in challenging social ills.
However, this seems a financially challenging and possibly decades-long endeavour.
