"tireless attempt" is correct and usable in written English.
You can use it when referring to an effort or action done without giving up, in spite of obstacles or difficulties. For example, "He made a tireless attempt to learn Spanish."
African critics attacked him for this attitude, Juliet Okonkwo writing in 1981 that his "excessive interest in sex activity, his tireless attempt to rake up filth, is alien to Africa – a continent of hope and realisable dreams".
This was from the early 1980s, when Amis was in his early 30s — just a year or two after he'd paid tribute to Vladimir Nabokov's "tireless attempt to pay full justice to the weird essence of things" — and when he was the least tired and most energetic stylist in a thoroughly exhausted Britain.
Despite the tireless attempts of motivated citizens, there is still no significant recycling of solid waste.
Foreign affairs minister Julie Bishop has said there would be "consequences" for these deaths, and no one criticises her tireless attempts to save these men's lives.
The novel-within-the-novel, "The Life, Art, and Opinions of Stewart Jameson," is cluttered with my hapless but tireless attempts to pay homage to Sterne — to pay, I guess, a debt.
The orchestra's organiser, Joy Bryer, has spoken about his concern for the individual welfare of the young players and his tireless attempts to help them in their careers after their time in the ECYO.
Yet he was entirely candid about the obsessions and preoccupations that fuelled his tireless attempts to come to terms with what he described as "the vulnerability of the human form".
We ought to pay tribute to the trailblazing work of Mark's former PGMOL mentor, Graham Poll – or Polly, as he likes to make third-person reference to himself – whose tireless attempts at self-promotion have yet to yield the stardom he appears to desire.
The tireless attempts to maintain power over citizens through Internet regulation and censorship may actually be threatening the economic power of the nation in an increasingly technological world.
And yet Ravitch's dogged and tireless attempts to put the breaks on the steamroller may begin to have borne some results buttressed by the recent revelations of test score cheating in public schools in major cities and the increasing awareness of parents that "reform" in their children's schools is really about "dumbing down" standards to give the appearance of improvement in learning.
We sure love their -- ahem! -- tireless effort.
