The word 'persistent' is correct and usable in written English.
It can be used to describe someone who does not give up easily and continues to work hard even in the face of challenges and obstacles. For example, "He was persistent in his pursuit of success, refusing to give up despite the difficulties he encountered."
There have been persistent claims from boys abused at Kincora and human rights organisations that military intelligence and the RUC knew about the rape of children in care but used the information to blackmail the paedophiles, forcing them to spy on fellow loyalists.
From the early 1980s onwards, Murdoch's best-selling daily, the Sun, has been a persistent critic of the European Union and all its works.
From claims he is a "cancer" in the dressing room to his persistent underperformance with the bat, this tour has been a shrieking, knives-out disaster for Watto.
He has been a persistent hit-maker, with a pedigree that includes opera and Shakespeare as well as commercial successes such as Boeing-Boeing and Matilda.
The symptoms of ovarian cancer include: abdominal or pelvic pain and increased abdominal size or persistent bloating; the need to urinate often or urgently or feeling full after eating a small amount.
One of the most persistent themes to crop up online in the wake of the Clinton announcement was "I wish I was American so that I could vote for Hillary".
The chief executive of the world's largest oil company will on Wednesday face two of the firm's most persistent environmental activist shareholders – a nun from New Jersey and a friar from Milwaukee.
But the UK parcels market continues to be over-supplied and the decline in letter use is persistent.
A study led by Noah Diffenbaugh at Stanford used modeling and statistics to find that these sorts of persistent high-pressure ridges are more likely to sit off California's coast in the presence of high levels of greenhouse gases in the atmosphere.
"In order to uproot the systemic embedded abuse that has allowed for the creation of such 'black sites' like that of Homan Square as well as police torturers like that of Jon Burge, transparent and persistent investigation is the first step of many," a statement attributed to the group read.
Though the growth will surely take many years and require persistent care, the women of Bosnia & Herzegovina hope that the seeds they have planted will continue to flourish.
