'intense and persistent' is a perfectly good phrase that can be used in written English.
It is typically used to describe a person or thing that puts in a lot of effort and is not easily dissuaded. For example: She continued working on the project with intense and persistent determination, eventually achieving her goal.
The Muslim Brotherhood, struggling to regain its footing after the intense and persistent police pressure, distanced itself from the call to strike, and said it would not participate.
His tinnitus, which he described as a "computer beeping" sound, was so intense and persistent that he needed sedatives to sleep at night.
In the weeks and months after his second surgery for colon cancer, Mr. Cohen fell into an intense and persistent state of anger that took a toll on his family.
Jingmai tea has an intense and persistent fragrance, and its tea infusion has a relatively weak bitter and strong astringent taste.
The illumination can be so intense and persistent that it remains visible after the filtering procedure in the Stable Lights images.
When not modulated or, when intense and persistent, these behaviors may lead to psychosocial losses over the course of life (Borsa & Bandeira 2014a).
Tasting Report: Globe-Trotting Wines High in Balance and Fruitiness Hagafen Syrah Napa Valley 1999: $28 *** [Rating: three stars] Dense and concentrated yet harmonious, with the intense fruitiness and persistent flavors of an Australian shiraz.
All participants agreed they sought help due to intense pain and persistent, unmanageable symptoms.
FFA has been found to be essentially tasteless whereas all panelists agreed that FFB has an intense coffee aroma and persistent bitter taste.
The majority of young children with cerebral palsy have high episodes of recurrent and intense persistent pain at levels of above 5 on a 10-point visual analogue scale (Engel & Kartin, 2006; Parkinson et al., 2013; Ramstad, Jahnsen, Skjeldal, & Diseth, 2011).
Compared with the experimental endotoxemia model (single dose of LPS), the inflammatory stimuli in critical illness are probably more intense, often persistent, and multiple in nature.
